Emerging Infections

The current tetravalent dengue vaccine TAK-003, from the Japanese laboratory Takeda, is not likely to control the ongoing epidemic, according to the Pan American Health Organization (PAHO). The organization emphasized the need to better understand the vaccine’s effectiveness against different serotypes and its safety under real-world clinical conditions.

The Americas are experiencing a record increase in dengue cases. Three times as many cases have been identified during 2024 (3.5 million) than were reported for the same period in 2023. 

“The vaccine we have available will not curb the dengue epidemic; it should be used complementarily with other actions. The most important actions are field operations, vector control, prevention, and education,” said Daniel Salas, MD, executive manager of the PAHO Comprehensive Immunization Program, during a press conference on March 28.

“The vaccines we currently have are not the best response to reduce transmission and prevent deaths,” added Jarbas Barbosa, MD, PhD, PAHO’s director. The fatality rate remains below 0.05%, but this figure could be hard to maintain if the situation becomes more uncontrolled.

The TAK-003 regimen consists of two doses with a 3-month interval between applications, so “it is not a tool to control transmission at this moment. Studies have shown that only 8 years of [population-level] vaccination would have a significant impact on dengue transmission,” said Dr. Barbosa.

A new vaccine developed in Brazil in partnership with the company MSD, Butantan-DV, is in phase 3 trials and has the advantage of being a single-dose application, which could facilitate its use in situations with accelerated transmission. “But this vaccine will likely only be available in 2025,” said Dr. Barbosa.

PAHO officials also highlighted the need to better characterize the vaccine’s effectiveness and safety in the real world. They observed, for example, that when TAK-003 was investigated, the circulation of dengue serotype 3 was almost nonexistent, so the efficacy data against that serotype “are very limited.”

“The producer, Takeda, has very limited production capacity. Brazil is the country that uses this vaccine the most, followed by Argentina. Given that these countries have a good epidemiological surveillance system and adverse effect registration, they can conduct studies on how the vaccine performs in real life, which will greatly increase our knowledge about it. For example, we will see its effectiveness against serotype 3,” said Dr. Barbosa.

The PAHO Technical Advisory Group (TAG) on vaccine-preventable diseases recommended that any country using these vaccines have surveillance systems in place because it is important to promptly report and investigate any adverse events, said Dr. Salas. The organization also suggested that vaccination should ideally be administered in a “more controlled environment,” a phase 4 study, “to complete the safety and efficacy profile, especially in those who have not had dengue before and for dengue 3 and 4,” said Dr. Salas in response to a question from this news organization.

“People cannot expect that just because they were vaccinated, they will not get dengue. The vaccine has limited reach,” he emphasized.

Other research strategies for vector control, such as the use of the Wolbachia bacteria and mosquito sterilization, are future strategies and “not tools to control this outbreak,” noted Sylvain Aldighieri, MD, director of the Department of Prevention, Control, and Elimination of Transmissible Diseases at PAHO.

In his opening remarks, Dr. Barbosa urged the intensification of efforts with tools that are already available. These approaches include eliminating mosquito breeding sites (“80% are in or near homes”) and protecting against mosquito bites, preparing health services for early diagnosis and timely clinical management, and educating the population about dengue symptoms so they seek medical attention immediately.

Although dengue is increasing throughout Latin America and the Caribbean, the most affected countries are Brazil (83%), Paraguay (5.3%), and Argentina (3.7%), which account for 92% of the cases and 87% of the deaths, PAHO reported.

This story was translated from the Medscape Spanish edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com .

The current tetravalent dengue vaccine TAK-003, from the Japanese laboratory Takeda, is not likely to control the ongoing epidemic, according to the Pan American Health Organization (PAHO). The organization emphasized the need to better understand the vaccine’s effectiveness against different serotypes and its safety under real-world clinical conditions.

The Americas are experiencing a record increase in dengue cases. Three times as many cases have been identified during 2024 (3.5 million) than were reported for the same period in 2023. 

“The vaccine we have available will not curb the dengue epidemic; it should be used complementarily with other actions. The most important actions are field operations, vector control, prevention, and education,” said Daniel Salas, MD, executive manager of the PAHO Comprehensive Immunization Program, during a press conference on March 28.

“The vaccines we currently have are not the best response to reduce transmission and prevent deaths,” added Jarbas Barbosa, MD, PhD, PAHO’s director. The fatality rate remains below 0.05%, but this figure could be hard to maintain if the situation becomes more uncontrolled.

The TAK-003 regimen consists of two doses with a 3-month interval between applications, so “it is not a tool to control transmission at this moment. Studies have shown that only 8 years of [population-level] vaccination would have a significant impact on dengue transmission,” said Dr. Barbosa.

A new vaccine developed in Brazil in partnership with the company MSD, Butantan-DV, is in phase 3 trials and has the advantage of being a single-dose application, which could facilitate its use in situations with accelerated transmission. “But this vaccine will likely only be available in 2025,” said Dr. Barbosa.

PAHO officials also highlighted the need to better characterize the vaccine’s effectiveness and safety in the real world. They observed, for example, that when TAK-003 was investigated, the circulation of dengue serotype 3 was almost nonexistent, so the efficacy data against that serotype “are very limited.”

“The producer, Takeda, has very limited production capacity. Brazil is the country that uses this vaccine the most, followed by Argentina. Given that these countries have a good epidemiological surveillance system and adverse effect registration, they can conduct studies on how the vaccine performs in real life, which will greatly increase our knowledge about it. For example, we will see its effectiveness against serotype 3,” said Dr. Barbosa.

The PAHO Technical Advisory Group (TAG) on vaccine-preventable diseases recommended that any country using these vaccines have surveillance systems in place because it is important to promptly report and investigate any adverse events, said Dr. Salas. The organization also suggested that vaccination should ideally be administered in a “more controlled environment,” a phase 4 study, “to complete the safety and efficacy profile, especially in those who have not had dengue before and for dengue 3 and 4,” said Dr. Salas in response to a question from this news organization.

“People cannot expect that just because they were vaccinated, they will not get dengue. The vaccine has limited reach,” he emphasized.

Other research strategies for vector control, such as the use of the Wolbachia bacteria and mosquito sterilization, are future strategies and “not tools to control this outbreak,” noted Sylvain Aldighieri, MD, director of the Department of Prevention, Control, and Elimination of Transmissible Diseases at PAHO.

In his opening remarks, Dr. Barbosa urged the intensification of efforts with tools that are already available. These approaches include eliminating mosquito breeding sites (“80% are in or near homes”) and protecting against mosquito bites, preparing health services for early diagnosis and timely clinical management, and educating the population about dengue symptoms so they seek medical attention immediately.

Although dengue is increasing throughout Latin America and the Caribbean, the most affected countries are Brazil (83%), Paraguay (5.3%), and Argentina (3.7%), which account for 92% of the cases and 87% of the deaths, PAHO reported.

This story was translated from the Medscape Spanish edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com .

The current tetravalent dengue vaccine TAK-003, from the Japanese laboratory Takeda, is not likely to control the ongoing epidemic, according to the Pan American Health Organization (PAHO). The organization emphasized the need to better understand the vaccine’s effectiveness against different serotypes and its safety under real-world clinical conditions.

The Americas are experiencing a record increase in dengue cases. Three times as many cases have been identified during 2024 (3.5 million) than were reported for the same period in 2023. 

“The vaccine we have available will not curb the dengue epidemic; it should be used complementarily with other actions. The most important actions are field operations, vector control, prevention, and education,” said Daniel Salas, MD, executive manager of the PAHO Comprehensive Immunization Program, during a press conference on March 28.

“The vaccines we currently have are not the best response to reduce transmission and prevent deaths,” added Jarbas Barbosa, MD, PhD, PAHO’s director. The fatality rate remains below 0.05%, but this figure could be hard to maintain if the situation becomes more uncontrolled.

The TAK-003 regimen consists of two doses with a 3-month interval between applications, so “it is not a tool to control transmission at this moment. Studies have shown that only 8 years of [population-level] vaccination would have a significant impact on dengue transmission,” said Dr. Barbosa.

A new vaccine developed in Brazil in partnership with the company MSD, Butantan-DV, is in phase 3 trials and has the advantage of being a single-dose application, which could facilitate its use in situations with accelerated transmission. “But this vaccine will likely only be available in 2025,” said Dr. Barbosa.

PAHO officials also highlighted the need to better characterize the vaccine’s effectiveness and safety in the real world. They observed, for example, that when TAK-003 was investigated, the circulation of dengue serotype 3 was almost nonexistent, so the efficacy data against that serotype “are very limited.”

“The producer, Takeda, has very limited production capacity. Brazil is the country that uses this vaccine the most, followed by Argentina. Given that these countries have a good epidemiological surveillance system and adverse effect registration, they can conduct studies on how the vaccine performs in real life, which will greatly increase our knowledge about it. For example, we will see its effectiveness against serotype 3,” said Dr. Barbosa.

The PAHO Technical Advisory Group (TAG) on vaccine-preventable diseases recommended that any country using these vaccines have surveillance systems in place because it is important to promptly report and investigate any adverse events, said Dr. Salas. The organization also suggested that vaccination should ideally be administered in a “more controlled environment,” a phase 4 study, “to complete the safety and efficacy profile, especially in those who have not had dengue before and for dengue 3 and 4,” said Dr. Salas in response to a question from this news organization.

“People cannot expect that just because they were vaccinated, they will not get dengue. The vaccine has limited reach,” he emphasized.

Other research strategies for vector control, such as the use of the Wolbachia bacteria and mosquito sterilization, are future strategies and “not tools to control this outbreak,” noted Sylvain Aldighieri, MD, director of the Department of Prevention, Control, and Elimination of Transmissible Diseases at PAHO.

In his opening remarks, Dr. Barbosa urged the intensification of efforts with tools that are already available. These approaches include eliminating mosquito breeding sites (“80% are in or near homes”) and protecting against mosquito bites, preparing health services for early diagnosis and timely clinical management, and educating the population about dengue symptoms so they seek medical attention immediately.

Although dengue is increasing throughout Latin America and the Caribbean, the most affected countries are Brazil (83%), Paraguay (5.3%), and Argentina (3.7%), which account for 92% of the cases and 87% of the deaths, PAHO reported.

This story was translated from the Medscape Spanish edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com .

Thanks to decades of successful vector control strategies, vector-borne transmission of Chagas disease has significantly decreased in many regions. Oral ingestion of Trypanosoma cruzi through contaminated food and beverages, however, is increasing. Unlike vector transmission, oral transmission of Chagas disease entails high lethality in pediatric and adult populations.

“The oral transmission of Chagas disease is becoming a much more recognized route, and it is crucial to understand that people can die from this type of transmission,” Norman L. Beatty, MD, assistant professor of infectious diseases and global medicine at the University of Florida College of Medicine in Gainesville, Florida, told this news organization. Dr. Beatty is the lead author of a recent article on the subject.

In regions where the parasite circulates in the environment, people are consuming foods, fruit juices, and possibly wild animal meat that may be contaminated. “As we experience changes in our environment and in the way we consume food, it is crucial to consider how food preparation is carried out in areas where T cruzi transmission occurs in the environment,” said Dr. Beatty. “And as organic farming methods without insecticides become increasingly common, more research is needed in these areas, both in Latin America and in the United States, to understand if oral transmission of T cruzi is occurring.”

In the Amazon basin, foodborne transmission is already the leading cause of acute Chagas disease. It has been described in Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, and Venezuela.

Dr. Beatty’s colleagues recently treated a Brazilian patient at the hospital in Florida. “He came to our hospital very ill, with acute myocarditis after consuming contaminated açaí.” Clarifying that there is widespread awareness about oral transmission in Brazil, he stated, “We are concerned that it may not be recognized in other areas of Latin America.”

Mexico and regions of Central America have little to no information on oral transmission, but it is likely occurring, and cases may be going undetected in the region, said Dr. Beatty.

He investigated the issue in Colombia as part of an international collaboration involving the University of Antioquia, aiming to find ways to mitigate oral transmission and create a model that can be used throughout Latin America and the United States. For the Colombia study, they reviewed all cases reported to the Ministry of Health and Social Protection, and oral transmission turned out to be more common than the research group expected. “Still, I imagine that in certain areas with limited resources…there are many more cases that are not being reported.

“A myth I would like to dispel is that Chagas disease is not being transmitted in the United States,” Dr. Beatty added. He mentioned that at least 30 American states have vectors, and in Florida, it was documented that triatomines invaded homes and bit residents. In addition, 30% of these insects are infected with T cruzi. Research is underway to determine whether Floridians are becoming infected and if they are also at risk of contracting Chagas disease orally, said Dr. Beatty. “In the United States, we know very little about how many people are infected and what the infection routes are. Much more research is needed.”

Roberto Chuit, MD, PhD, a doctor in public health and an external consultant for the Pan American Health Organization (PAHO), agreed that this route of food contamination, which occurs because of vector-borne parasites, was until recently masked or hidden by the predominance of vector presence. Just as it began to gain importance as other transmission routes were controlled, “it now has extremely high importance in the Americas, as does vertical transmission,” he said.

In 2023, more than 50 years after the first description of oral transmission, the PAHO expert meeting proposed to alert health services and the broader community about the severity and potential lethality of oral Chagas disease outbreaks to elicit immediate responses and mitigation measures. The body also proposed conducting studies to provide detailed information on the contamination source and the wild vectors present in oral transmission foci.
 

Unique Clinical Manifestations

The exacerbated signs and symptoms of oral infection (see sidebar) are attributed to the high parasite loads in contaminated food and beverages. A single crushed triatomine along with a food or beverage harboring T cruzi can contain an estimated 600,000 metacyclic trypomastigotes, compared with 3000-4000 per µL when infection occurs by triatomine fecal matter. The robust systemic immune response observed in patients with acute oral Chagas disease is thought to result from more efficient transmission after penetration through the oral, pharyngeal, and gastric mucosae.
 

Seven Things to Know About Orally Transmitted Chagas Disease

1. It presents with exacerbated symptoms and rapid disease progression in immunocompetent individuals. This presentation is not common in vector-borne, congenital, or transfusion-related transmission. It can cause fulminant myocarditis and heart failure, meningoencephalitis, or potentially fatal shock due to parasitemia.

2. Most patients (71%-100%) with acute oral Chagas present with fever.

3. Electrocardiographic abnormalities, specifically ventricular depolarization alterations and pericardial involvement, are observed in most patients.

4. Facial edema, which typically affects the entire face and parts of the lips, is present in 57%-100% of patients with acute oral Chagas disease. In those with acute symptoms from vector transmission, unilateral periorbital swelling (Romaña’s sign) is more common.

5. Other notable systemic symptoms include edema of the lower extremities, myalgia, generalized lymphadenopathy, abdominal discomfort, dyspnea, vomiting, diarrhea, hepatomegaly, splenomegaly, headache, chest pain, cutaneous erythematous rash, jaundice, arthralgia, epistaxis, hematemesis, melena, and palpitations.

6. The incubation period after oral ingestion of products contaminated with Trypanosoma cruzi is approximately 3-22 days, in contrast to 4-15 days for vector-borne transmission and 8-160 days for transfusion and transplant-related transmission.

7. Patients need antiparasitic drugs immediately.
 

Thinking Epidemiologically

Dr. Chuit recalled that suspicion of food contamination should be based on epidemiology, especially in outbreaks affecting several people and in regions where Chagas vectors have been described. Sometimes, however, a single careless tourist consumes contaminated products.

“The difficulty is that many times it is not considered, and if it is not considered, the search for the parasite is not requested,” said Dr. Chuit. He added that it is common for the professional to consider Chagas disease only if viral and bacterial isolation tests are negative. Clinicians sometimes consider Chagas disease because the patient has not responded to regular treatments for other causes, such as antibiotics and hydration.

Epidemiology is important, especially when Chagas disease is diagnosed in groups or a family, because they are usually not isolated cases but outbreaks of 3-40 cases, according to Dr. Chuit. “Under these conditions, it must be quickly considered…that this parasite may be involved.”

One of the difficulties is that the source of these oral transmissions is not recognized most of the time. In general, the sources are usually foods that are more likely to be contaminated by insects or insect feces, such as orange juice or sugarcane. But in fact, any food or beverage left unattended could be contaminated by vectors or possible secretions from infected marsupial odoriferous glands.

An analysis of 32 outbreaks from 1965 to 2022 showed that the main foods involved in oral transmission were homemade fruit juices. But different vector species were identified, and the reservoirs were mainly dogs, rodents, and large American opossums (Didelphis).

The largest oral Chagas outbreak was linked to the consumption of contaminated guava juice in a primary school in Caracas, Venezuela. Nonindustrially produced açaí is a common source of orally acquired Chagas disease in Brazil. In Colombia, Chagas disease has been associated with the consumption of palm wine, sugar cane, and tangerine juice. Other oral transmission routes include consuming meat from wild animals and ingesting blood from infected armadillos, which is related to a traditional medicine practice.
 

Deadly Yet Easily Treatable

In the outbreak of 119 confirmed and suspected cases in Venezuela, 20.3% required hospitalization, and a 5-year-old child died of acute myocarditis. These percentages differ from those reported in vector transmission, which is asymptomatic in the acute phase for 95%-99% of cases or will only develop a mild febrile illness that resolves on its own.

“Not all cases will present as severe, because depending on the inoculum, there may be individuals with subclinical situations. But any food poisoning that occurs in endemic areas, where food is not properly controlled, and these street foods are associated with processes in jungle areas, raises the possibility that T cruzi is involved and should be considered as a differential diagnosis,» noted Dr. Chuit. “The treatment is highly effective, and people recover quickly.”

“The most important thing about oral transmission of Chagas is that someone infected in this way needs antiparasitic drugs immediately. We can cure them if we treat them immediately,” said Dr. Beatty, adding that treatment is sometimes delayed due to lack of access to appropriate antiparasitic drugs. “Here in the United States and in Latin America, it is quite common for healthcare professionals not to understand the differences between vector, vertical, and oral transmission. By not treating these patients, they become ill quickly.”

Dr. Beatty and Dr. Chuit declared no relevant financial conflicts of interest.

This story was translated from the Medscape Spanish edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

Thanks to decades of successful vector control strategies, vector-borne transmission of Chagas disease has significantly decreased in many regions. Oral ingestion of Trypanosoma cruzi through contaminated food and beverages, however, is increasing. Unlike vector transmission, oral transmission of Chagas disease entails high lethality in pediatric and adult populations.

“The oral transmission of Chagas disease is becoming a much more recognized route, and it is crucial to understand that people can die from this type of transmission,” Norman L. Beatty, MD, assistant professor of infectious diseases and global medicine at the University of Florida College of Medicine in Gainesville, Florida, told this news organization. Dr. Beatty is the lead author of a recent article on the subject.

In regions where the parasite circulates in the environment, people are consuming foods, fruit juices, and possibly wild animal meat that may be contaminated. “As we experience changes in our environment and in the way we consume food, it is crucial to consider how food preparation is carried out in areas where T cruzi transmission occurs in the environment,” said Dr. Beatty. “And as organic farming methods without insecticides become increasingly common, more research is needed in these areas, both in Latin America and in the United States, to understand if oral transmission of T cruzi is occurring.”

In the Amazon basin, foodborne transmission is already the leading cause of acute Chagas disease. It has been described in Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, and Venezuela.

Dr. Beatty’s colleagues recently treated a Brazilian patient at the hospital in Florida. “He came to our hospital very ill, with acute myocarditis after consuming contaminated açaí.” Clarifying that there is widespread awareness about oral transmission in Brazil, he stated, “We are concerned that it may not be recognized in other areas of Latin America.”

Mexico and regions of Central America have little to no information on oral transmission, but it is likely occurring, and cases may be going undetected in the region, said Dr. Beatty.

He investigated the issue in Colombia as part of an international collaboration involving the University of Antioquia, aiming to find ways to mitigate oral transmission and create a model that can be used throughout Latin America and the United States. For the Colombia study, they reviewed all cases reported to the Ministry of Health and Social Protection, and oral transmission turned out to be more common than the research group expected. “Still, I imagine that in certain areas with limited resources…there are many more cases that are not being reported.

“A myth I would like to dispel is that Chagas disease is not being transmitted in the United States,” Dr. Beatty added. He mentioned that at least 30 American states have vectors, and in Florida, it was documented that triatomines invaded homes and bit residents. In addition, 30% of these insects are infected with T cruzi. Research is underway to determine whether Floridians are becoming infected and if they are also at risk of contracting Chagas disease orally, said Dr. Beatty. “In the United States, we know very little about how many people are infected and what the infection routes are. Much more research is needed.”

Roberto Chuit, MD, PhD, a doctor in public health and an external consultant for the Pan American Health Organization (PAHO), agreed that this route of food contamination, which occurs because of vector-borne parasites, was until recently masked or hidden by the predominance of vector presence. Just as it began to gain importance as other transmission routes were controlled, “it now has extremely high importance in the Americas, as does vertical transmission,” he said.

In 2023, more than 50 years after the first description of oral transmission, the PAHO expert meeting proposed to alert health services and the broader community about the severity and potential lethality of oral Chagas disease outbreaks to elicit immediate responses and mitigation measures. The body also proposed conducting studies to provide detailed information on the contamination source and the wild vectors present in oral transmission foci.
 

Unique Clinical Manifestations

The exacerbated signs and symptoms of oral infection (see sidebar) are attributed to the high parasite loads in contaminated food and beverages. A single crushed triatomine along with a food or beverage harboring T cruzi can contain an estimated 600,000 metacyclic trypomastigotes, compared with 3000-4000 per µL when infection occurs by triatomine fecal matter. The robust systemic immune response observed in patients with acute oral Chagas disease is thought to result from more efficient transmission after penetration through the oral, pharyngeal, and gastric mucosae.
 

Seven Things to Know About Orally Transmitted Chagas Disease

1. It presents with exacerbated symptoms and rapid disease progression in immunocompetent individuals. This presentation is not common in vector-borne, congenital, or transfusion-related transmission. It can cause fulminant myocarditis and heart failure, meningoencephalitis, or potentially fatal shock due to parasitemia.

2. Most patients (71%-100%) with acute oral Chagas present with fever.

3. Electrocardiographic abnormalities, specifically ventricular depolarization alterations and pericardial involvement, are observed in most patients.

4. Facial edema, which typically affects the entire face and parts of the lips, is present in 57%-100% of patients with acute oral Chagas disease. In those with acute symptoms from vector transmission, unilateral periorbital swelling (Romaña’s sign) is more common.

5. Other notable systemic symptoms include edema of the lower extremities, myalgia, generalized lymphadenopathy, abdominal discomfort, dyspnea, vomiting, diarrhea, hepatomegaly, splenomegaly, headache, chest pain, cutaneous erythematous rash, jaundice, arthralgia, epistaxis, hematemesis, melena, and palpitations.

6. The incubation period after oral ingestion of products contaminated with Trypanosoma cruzi is approximately 3-22 days, in contrast to 4-15 days for vector-borne transmission and 8-160 days for transfusion and transplant-related transmission.

7. Patients need antiparasitic drugs immediately.
 

Thinking Epidemiologically

Dr. Chuit recalled that suspicion of food contamination should be based on epidemiology, especially in outbreaks affecting several people and in regions where Chagas vectors have been described. Sometimes, however, a single careless tourist consumes contaminated products.

“The difficulty is that many times it is not considered, and if it is not considered, the search for the parasite is not requested,” said Dr. Chuit. He added that it is common for the professional to consider Chagas disease only if viral and bacterial isolation tests are negative. Clinicians sometimes consider Chagas disease because the patient has not responded to regular treatments for other causes, such as antibiotics and hydration.

Epidemiology is important, especially when Chagas disease is diagnosed in groups or a family, because they are usually not isolated cases but outbreaks of 3-40 cases, according to Dr. Chuit. “Under these conditions, it must be quickly considered…that this parasite may be involved.”

One of the difficulties is that the source of these oral transmissions is not recognized most of the time. In general, the sources are usually foods that are more likely to be contaminated by insects or insect feces, such as orange juice or sugarcane. But in fact, any food or beverage left unattended could be contaminated by vectors or possible secretions from infected marsupial odoriferous glands.

An analysis of 32 outbreaks from 1965 to 2022 showed that the main foods involved in oral transmission were homemade fruit juices. But different vector species were identified, and the reservoirs were mainly dogs, rodents, and large American opossums (Didelphis).

The largest oral Chagas outbreak was linked to the consumption of contaminated guava juice in a primary school in Caracas, Venezuela. Nonindustrially produced açaí is a common source of orally acquired Chagas disease in Brazil. In Colombia, Chagas disease has been associated with the consumption of palm wine, sugar cane, and tangerine juice. Other oral transmission routes include consuming meat from wild animals and ingesting blood from infected armadillos, which is related to a traditional medicine practice.
 

Deadly Yet Easily Treatable

In the outbreak of 119 confirmed and suspected cases in Venezuela, 20.3% required hospitalization, and a 5-year-old child died of acute myocarditis. These percentages differ from those reported in vector transmission, which is asymptomatic in the acute phase for 95%-99% of cases or will only develop a mild febrile illness that resolves on its own.

“Not all cases will present as severe, because depending on the inoculum, there may be individuals with subclinical situations. But any food poisoning that occurs in endemic areas, where food is not properly controlled, and these street foods are associated with processes in jungle areas, raises the possibility that T cruzi is involved and should be considered as a differential diagnosis,» noted Dr. Chuit. “The treatment is highly effective, and people recover quickly.”

“The most important thing about oral transmission of Chagas is that someone infected in this way needs antiparasitic drugs immediately. We can cure them if we treat them immediately,” said Dr. Beatty, adding that treatment is sometimes delayed due to lack of access to appropriate antiparasitic drugs. “Here in the United States and in Latin America, it is quite common for healthcare professionals not to understand the differences between vector, vertical, and oral transmission. By not treating these patients, they become ill quickly.”

Dr. Beatty and Dr. Chuit declared no relevant financial conflicts of interest.

This story was translated from the Medscape Spanish edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

Thanks to decades of successful vector control strategies, vector-borne transmission of Chagas disease has significantly decreased in many regions. Oral ingestion of Trypanosoma cruzi through contaminated food and beverages, however, is increasing. Unlike vector transmission, oral transmission of Chagas disease entails high lethality in pediatric and adult populations.

“The oral transmission of Chagas disease is becoming a much more recognized route, and it is crucial to understand that people can die from this type of transmission,” Norman L. Beatty, MD, assistant professor of infectious diseases and global medicine at the University of Florida College of Medicine in Gainesville, Florida, told this news organization. Dr. Beatty is the lead author of a recent article on the subject.

In regions where the parasite circulates in the environment, people are consuming foods, fruit juices, and possibly wild animal meat that may be contaminated. “As we experience changes in our environment and in the way we consume food, it is crucial to consider how food preparation is carried out in areas where T cruzi transmission occurs in the environment,” said Dr. Beatty. “And as organic farming methods without insecticides become increasingly common, more research is needed in these areas, both in Latin America and in the United States, to understand if oral transmission of T cruzi is occurring.”

In the Amazon basin, foodborne transmission is already the leading cause of acute Chagas disease. It has been described in Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, and Venezuela.

Dr. Beatty’s colleagues recently treated a Brazilian patient at the hospital in Florida. “He came to our hospital very ill, with acute myocarditis after consuming contaminated açaí.” Clarifying that there is widespread awareness about oral transmission in Brazil, he stated, “We are concerned that it may not be recognized in other areas of Latin America.”

Mexico and regions of Central America have little to no information on oral transmission, but it is likely occurring, and cases may be going undetected in the region, said Dr. Beatty.

He investigated the issue in Colombia as part of an international collaboration involving the University of Antioquia, aiming to find ways to mitigate oral transmission and create a model that can be used throughout Latin America and the United States. For the Colombia study, they reviewed all cases reported to the Ministry of Health and Social Protection, and oral transmission turned out to be more common than the research group expected. “Still, I imagine that in certain areas with limited resources…there are many more cases that are not being reported.

“A myth I would like to dispel is that Chagas disease is not being transmitted in the United States,” Dr. Beatty added. He mentioned that at least 30 American states have vectors, and in Florida, it was documented that triatomines invaded homes and bit residents. In addition, 30% of these insects are infected with T cruzi. Research is underway to determine whether Floridians are becoming infected and if they are also at risk of contracting Chagas disease orally, said Dr. Beatty. “In the United States, we know very little about how many people are infected and what the infection routes are. Much more research is needed.”

Roberto Chuit, MD, PhD, a doctor in public health and an external consultant for the Pan American Health Organization (PAHO), agreed that this route of food contamination, which occurs because of vector-borne parasites, was until recently masked or hidden by the predominance of vector presence. Just as it began to gain importance as other transmission routes were controlled, “it now has extremely high importance in the Americas, as does vertical transmission,” he said.

In 2023, more than 50 years after the first description of oral transmission, the PAHO expert meeting proposed to alert health services and the broader community about the severity and potential lethality of oral Chagas disease outbreaks to elicit immediate responses and mitigation measures. The body also proposed conducting studies to provide detailed information on the contamination source and the wild vectors present in oral transmission foci.
 

Unique Clinical Manifestations

The exacerbated signs and symptoms of oral infection (see sidebar) are attributed to the high parasite loads in contaminated food and beverages. A single crushed triatomine along with a food or beverage harboring T cruzi can contain an estimated 600,000 metacyclic trypomastigotes, compared with 3000-4000 per µL when infection occurs by triatomine fecal matter. The robust systemic immune response observed in patients with acute oral Chagas disease is thought to result from more efficient transmission after penetration through the oral, pharyngeal, and gastric mucosae.
 

Seven Things to Know About Orally Transmitted Chagas Disease

1. It presents with exacerbated symptoms and rapid disease progression in immunocompetent individuals. This presentation is not common in vector-borne, congenital, or transfusion-related transmission. It can cause fulminant myocarditis and heart failure, meningoencephalitis, or potentially fatal shock due to parasitemia.

2. Most patients (71%-100%) with acute oral Chagas present with fever.

3. Electrocardiographic abnormalities, specifically ventricular depolarization alterations and pericardial involvement, are observed in most patients.

4. Facial edema, which typically affects the entire face and parts of the lips, is present in 57%-100% of patients with acute oral Chagas disease. In those with acute symptoms from vector transmission, unilateral periorbital swelling (Romaña’s sign) is more common.

5. Other notable systemic symptoms include edema of the lower extremities, myalgia, generalized lymphadenopathy, abdominal discomfort, dyspnea, vomiting, diarrhea, hepatomegaly, splenomegaly, headache, chest pain, cutaneous erythematous rash, jaundice, arthralgia, epistaxis, hematemesis, melena, and palpitations.

6. The incubation period after oral ingestion of products contaminated with Trypanosoma cruzi is approximately 3-22 days, in contrast to 4-15 days for vector-borne transmission and 8-160 days for transfusion and transplant-related transmission.

7. Patients need antiparasitic drugs immediately.
 

Thinking Epidemiologically

Dr. Chuit recalled that suspicion of food contamination should be based on epidemiology, especially in outbreaks affecting several people and in regions where Chagas vectors have been described. Sometimes, however, a single careless tourist consumes contaminated products.

“The difficulty is that many times it is not considered, and if it is not considered, the search for the parasite is not requested,” said Dr. Chuit. He added that it is common for the professional to consider Chagas disease only if viral and bacterial isolation tests are negative. Clinicians sometimes consider Chagas disease because the patient has not responded to regular treatments for other causes, such as antibiotics and hydration.

Epidemiology is important, especially when Chagas disease is diagnosed in groups or a family, because they are usually not isolated cases but outbreaks of 3-40 cases, according to Dr. Chuit. “Under these conditions, it must be quickly considered…that this parasite may be involved.”

One of the difficulties is that the source of these oral transmissions is not recognized most of the time. In general, the sources are usually foods that are more likely to be contaminated by insects or insect feces, such as orange juice or sugarcane. But in fact, any food or beverage left unattended could be contaminated by vectors or possible secretions from infected marsupial odoriferous glands.

An analysis of 32 outbreaks from 1965 to 2022 showed that the main foods involved in oral transmission were homemade fruit juices. But different vector species were identified, and the reservoirs were mainly dogs, rodents, and large American opossums (Didelphis).

The largest oral Chagas outbreak was linked to the consumption of contaminated guava juice in a primary school in Caracas, Venezuela. Nonindustrially produced açaí is a common source of orally acquired Chagas disease in Brazil. In Colombia, Chagas disease has been associated with the consumption of palm wine, sugar cane, and tangerine juice. Other oral transmission routes include consuming meat from wild animals and ingesting blood from infected armadillos, which is related to a traditional medicine practice.
 

Deadly Yet Easily Treatable

In the outbreak of 119 confirmed and suspected cases in Venezuela, 20.3% required hospitalization, and a 5-year-old child died of acute myocarditis. These percentages differ from those reported in vector transmission, which is asymptomatic in the acute phase for 95%-99% of cases or will only develop a mild febrile illness that resolves on its own.

“Not all cases will present as severe, because depending on the inoculum, there may be individuals with subclinical situations. But any food poisoning that occurs in endemic areas, where food is not properly controlled, and these street foods are associated with processes in jungle areas, raises the possibility that T cruzi is involved and should be considered as a differential diagnosis,» noted Dr. Chuit. “The treatment is highly effective, and people recover quickly.”

“The most important thing about oral transmission of Chagas is that someone infected in this way needs antiparasitic drugs immediately. We can cure them if we treat them immediately,” said Dr. Beatty, adding that treatment is sometimes delayed due to lack of access to appropriate antiparasitic drugs. “Here in the United States and in Latin America, it is quite common for healthcare professionals not to understand the differences between vector, vertical, and oral transmission. By not treating these patients, they become ill quickly.”

Dr. Beatty and Dr. Chuit declared no relevant financial conflicts of interest.

This story was translated from the Medscape Spanish edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

The Ervebo vaccine not only reduces the risk for Ebola infection but also halves mortality rates. This is the result of a study published in The Lancet Infectious Diseases.

Rebecca Coulborn, an epidemiologist at Epicentre in Paris, France, and colleagues analyzed data collected during the 10th Ebola epidemic in the Democratic Republic of the Congo. Their analysis revealed that among the 2279 patients with confirmed Ebola who were admitted to an Ebola health facility between July 27, 2018, and April 27, 2020, the mortality risk was 56% for unvaccinated patients. In vaccinated patients, however, it was only 25%. The reduced mortality applied to all patients, regardless of age and gender.

The study was funded by Doctors Without Borders. For data collection, Epicentre, the epidemiological division of Doctors Without Borders, collaborated with the Institut National de Recherche Biomédicale and the Ministry of Health of the Democratic Republic of the Congo.

The study authors focused on the Ervebo vaccine, which is approved for use against Zaire ebolavirus in the European Union, the United States, and some African countries, among others. It is the only Ebola vaccine currently recommended for use during an epidemic. It is administered intramuscularly as a single dose and is approved for adults aged 18 years and older.

The vaccine is primarily recommended for ring vaccination of individuals at a high risk for infection during an epidemic. In studies, the vaccine has been used for ring vaccinations among contacts of diagnosed cases since the end of the Ebola outbreak in West Africa in 2014 and 2015 and since 2018 in the Democratic Republic of the Congo.

The preliminary estimated vaccine effectiveness 10 days after vaccination is 97.5%-100%. The duration of protection is unknown. Individuals who became ill despite vaccination typically experienced a milder course of illness.

Although people should be vaccinated as early as possible during Ebola outbreaks, the results of the Epicentre study showed that the vaccine still protects against the risk for infection even when administered after exposure to the virus.

Furthermore, Dr. Coulborn and her team found no antagonistic effect between vaccination and Ebola treatment in their analysis. “Vaccination following exposure to a person infected with Ebola still provides significant protection against death, even if administered shortly before the onset of symptoms,” said study author Dr. Coulborn in a press release from Doctors Without Borders.

This story was translated from the Medscape German edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

The Ervebo vaccine not only reduces the risk for Ebola infection but also halves mortality rates. This is the result of a study published in The Lancet Infectious Diseases.

Rebecca Coulborn, an epidemiologist at Epicentre in Paris, France, and colleagues analyzed data collected during the 10th Ebola epidemic in the Democratic Republic of the Congo. Their analysis revealed that among the 2279 patients with confirmed Ebola who were admitted to an Ebola health facility between July 27, 2018, and April 27, 2020, the mortality risk was 56% for unvaccinated patients. In vaccinated patients, however, it was only 25%. The reduced mortality applied to all patients, regardless of age and gender.

The study was funded by Doctors Without Borders. For data collection, Epicentre, the epidemiological division of Doctors Without Borders, collaborated with the Institut National de Recherche Biomédicale and the Ministry of Health of the Democratic Republic of the Congo.

The study authors focused on the Ervebo vaccine, which is approved for use against Zaire ebolavirus in the European Union, the United States, and some African countries, among others. It is the only Ebola vaccine currently recommended for use during an epidemic. It is administered intramuscularly as a single dose and is approved for adults aged 18 years and older.

The vaccine is primarily recommended for ring vaccination of individuals at a high risk for infection during an epidemic. In studies, the vaccine has been used for ring vaccinations among contacts of diagnosed cases since the end of the Ebola outbreak in West Africa in 2014 and 2015 and since 2018 in the Democratic Republic of the Congo.

The preliminary estimated vaccine effectiveness 10 days after vaccination is 97.5%-100%. The duration of protection is unknown. Individuals who became ill despite vaccination typically experienced a milder course of illness.

Although people should be vaccinated as early as possible during Ebola outbreaks, the results of the Epicentre study showed that the vaccine still protects against the risk for infection even when administered after exposure to the virus.

Furthermore, Dr. Coulborn and her team found no antagonistic effect between vaccination and Ebola treatment in their analysis. “Vaccination following exposure to a person infected with Ebola still provides significant protection against death, even if administered shortly before the onset of symptoms,” said study author Dr. Coulborn in a press release from Doctors Without Borders.

This story was translated from the Medscape German edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

The Ervebo vaccine not only reduces the risk for Ebola infection but also halves mortality rates. This is the result of a study published in The Lancet Infectious Diseases.

Rebecca Coulborn, an epidemiologist at Epicentre in Paris, France, and colleagues analyzed data collected during the 10th Ebola epidemic in the Democratic Republic of the Congo. Their analysis revealed that among the 2279 patients with confirmed Ebola who were admitted to an Ebola health facility between July 27, 2018, and April 27, 2020, the mortality risk was 56% for unvaccinated patients. In vaccinated patients, however, it was only 25%. The reduced mortality applied to all patients, regardless of age and gender.

The study was funded by Doctors Without Borders. For data collection, Epicentre, the epidemiological division of Doctors Without Borders, collaborated with the Institut National de Recherche Biomédicale and the Ministry of Health of the Democratic Republic of the Congo.

The study authors focused on the Ervebo vaccine, which is approved for use against Zaire ebolavirus in the European Union, the United States, and some African countries, among others. It is the only Ebola vaccine currently recommended for use during an epidemic. It is administered intramuscularly as a single dose and is approved for adults aged 18 years and older.

The vaccine is primarily recommended for ring vaccination of individuals at a high risk for infection during an epidemic. In studies, the vaccine has been used for ring vaccinations among contacts of diagnosed cases since the end of the Ebola outbreak in West Africa in 2014 and 2015 and since 2018 in the Democratic Republic of the Congo.

The preliminary estimated vaccine effectiveness 10 days after vaccination is 97.5%-100%. The duration of protection is unknown. Individuals who became ill despite vaccination typically experienced a milder course of illness.

Although people should be vaccinated as early as possible during Ebola outbreaks, the results of the Epicentre study showed that the vaccine still protects against the risk for infection even when administered after exposure to the virus.

Furthermore, Dr. Coulborn and her team found no antagonistic effect between vaccination and Ebola treatment in their analysis. “Vaccination following exposure to a person infected with Ebola still provides significant protection against death, even if administered shortly before the onset of symptoms,” said study author Dr. Coulborn in a press release from Doctors Without Borders.

This story was translated from the Medscape German edition using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

Non–Lyme disease, tick-borne illnesses — such as spotted fever group rickettsiosis (SFGR), ehrlichiosis, and alpha-gal syndrome (AGS) — are emerging public health threats, but whether prior tick exposures are responsible for long-term complications, such as musculoskeletal symptoms or osteoarthritis, has been unclear.

Many patients attribute their nonspecific long-term symptoms, such as musculoskeletal pain, to previous illnesses from tick bites, note authors of a study published in JAMA Network Open. But the researchers, led by Diana L. Zychowski, MD, MPH, with the Division of Infectious Diseases at the University of North Carolina at Chapel Hill, found that Ehrlichia or Rickettsia seropositivity was not associated with chronic musculoskeletal symptoms, though they write that “further investigation into the pathogenesis of [alpha-gal] syndrome is needed.”
 

Tick-Borne Illness Cases Multiplying

Cases of tick-borne illness (TBD) in the United States have multiplied in recent years. More than 50,000 cases of TBD in the United States were reported in 2019, which doubled the number of cases over the previous 2 decades, the authors note.

Most of the cases are Lyme disease, but others — including SFGR and ehrlichiosis — represent an important public health threat, especially in southeastern states, the authors write. Cases of ehrlichiosis, for example, transmitted by the lone star tick, soared more than 10-fold since 2000.

The goal of this study was to evaluate whether there was an association between prior exposure to TBDs endemic to the southeastern United States and chronic musculoskeletal symptoms and radiographic measures of osteoarthritis.

Researchers analyzed 488 blood samples from the fourth visit (2017-2018) of the Johnston County Osteoarthritis (JoCo OA) project, an ongoing population-based study in Johnston County, North Carolina. JoCo OA participants include noninstitutionalized White and Black Johnston County residents 45 years old or older with osteoarthritis.

They measured seroprevalence of Rickettsia- and Ehrlichia-specific immunoglobulin G (IgG) as well as alpha-gal immunoglobulin E (IgE) in patient samples. Only alpha-gal IgE was linked in the study with knee pain, aching, or stiffness. Antibodies to Rickettsia, Ehrlichia, and alpha-gal were not associated with radiographic, symptomatic knee osteoarthritis.

“To our knowledge,” the authors write, “this study was the first population-based seroprevalence study of SFGR, Ehrlichia, and [alpha]-gal.”

The study also found a high prevalence of TBD exposure in the cohort. More than a third (36.5%) had either an alpha-gal IgE level greater than 0.1 IU/mL, a positive test for SFGR IgG antibodies, or a positive test for Ehrlichia IgG antibodies.

Given that not every tick carries an infectious pathogen, the findings show human-tick interactions are common, they write.

“These findings suggest that substantial investment is required to examine the pathogenesis of these TBDs and interventions to reduce human-tick interactions,” the authors conclude.

This study was funded by a Creativity Hub Award from the University of North Carolina Office of the Vice Chancellor for Research. The JoCo OA project is supported in part by grants from the Association of Schools of Public Health/Centers for Disease Control and Prevention (CDC); and grants from the National Institute of Arthritis and Musculoskeletal and Skin Diseases. Authors reported grants from the National Institutes of Health, the CDC, and several pharmaceutical companies.

Non–Lyme disease, tick-borne illnesses — such as spotted fever group rickettsiosis (SFGR), ehrlichiosis, and alpha-gal syndrome (AGS) — are emerging public health threats, but whether prior tick exposures are responsible for long-term complications, such as musculoskeletal symptoms or osteoarthritis, has been unclear.

Many patients attribute their nonspecific long-term symptoms, such as musculoskeletal pain, to previous illnesses from tick bites, note authors of a study published in JAMA Network Open. But the researchers, led by Diana L. Zychowski, MD, MPH, with the Division of Infectious Diseases at the University of North Carolina at Chapel Hill, found that Ehrlichia or Rickettsia seropositivity was not associated with chronic musculoskeletal symptoms, though they write that “further investigation into the pathogenesis of [alpha-gal] syndrome is needed.”
 

Tick-Borne Illness Cases Multiplying

Cases of tick-borne illness (TBD) in the United States have multiplied in recent years. More than 50,000 cases of TBD in the United States were reported in 2019, which doubled the number of cases over the previous 2 decades, the authors note.

Most of the cases are Lyme disease, but others — including SFGR and ehrlichiosis — represent an important public health threat, especially in southeastern states, the authors write. Cases of ehrlichiosis, for example, transmitted by the lone star tick, soared more than 10-fold since 2000.

The goal of this study was to evaluate whether there was an association between prior exposure to TBDs endemic to the southeastern United States and chronic musculoskeletal symptoms and radiographic measures of osteoarthritis.

Researchers analyzed 488 blood samples from the fourth visit (2017-2018) of the Johnston County Osteoarthritis (JoCo OA) project, an ongoing population-based study in Johnston County, North Carolina. JoCo OA participants include noninstitutionalized White and Black Johnston County residents 45 years old or older with osteoarthritis.

They measured seroprevalence of Rickettsia- and Ehrlichia-specific immunoglobulin G (IgG) as well as alpha-gal immunoglobulin E (IgE) in patient samples. Only alpha-gal IgE was linked in the study with knee pain, aching, or stiffness. Antibodies to Rickettsia, Ehrlichia, and alpha-gal were not associated with radiographic, symptomatic knee osteoarthritis.

“To our knowledge,” the authors write, “this study was the first population-based seroprevalence study of SFGR, Ehrlichia, and [alpha]-gal.”

The study also found a high prevalence of TBD exposure in the cohort. More than a third (36.5%) had either an alpha-gal IgE level greater than 0.1 IU/mL, a positive test for SFGR IgG antibodies, or a positive test for Ehrlichia IgG antibodies.

Given that not every tick carries an infectious pathogen, the findings show human-tick interactions are common, they write.

“These findings suggest that substantial investment is required to examine the pathogenesis of these TBDs and interventions to reduce human-tick interactions,” the authors conclude.

This study was funded by a Creativity Hub Award from the University of North Carolina Office of the Vice Chancellor for Research. The JoCo OA project is supported in part by grants from the Association of Schools of Public Health/Centers for Disease Control and Prevention (CDC); and grants from the National Institute of Arthritis and Musculoskeletal and Skin Diseases. Authors reported grants from the National Institutes of Health, the CDC, and several pharmaceutical companies.

Non–Lyme disease, tick-borne illnesses — such as spotted fever group rickettsiosis (SFGR), ehrlichiosis, and alpha-gal syndrome (AGS) — are emerging public health threats, but whether prior tick exposures are responsible for long-term complications, such as musculoskeletal symptoms or osteoarthritis, has been unclear.

Many patients attribute their nonspecific long-term symptoms, such as musculoskeletal pain, to previous illnesses from tick bites, note authors of a study published in JAMA Network Open. But the researchers, led by Diana L. Zychowski, MD, MPH, with the Division of Infectious Diseases at the University of North Carolina at Chapel Hill, found that Ehrlichia or Rickettsia seropositivity was not associated with chronic musculoskeletal symptoms, though they write that “further investigation into the pathogenesis of [alpha-gal] syndrome is needed.”
 

Tick-Borne Illness Cases Multiplying

Cases of tick-borne illness (TBD) in the United States have multiplied in recent years. More than 50,000 cases of TBD in the United States were reported in 2019, which doubled the number of cases over the previous 2 decades, the authors note.

Most of the cases are Lyme disease, but others — including SFGR and ehrlichiosis — represent an important public health threat, especially in southeastern states, the authors write. Cases of ehrlichiosis, for example, transmitted by the lone star tick, soared more than 10-fold since 2000.

The goal of this study was to evaluate whether there was an association between prior exposure to TBDs endemic to the southeastern United States and chronic musculoskeletal symptoms and radiographic measures of osteoarthritis.

Researchers analyzed 488 blood samples from the fourth visit (2017-2018) of the Johnston County Osteoarthritis (JoCo OA) project, an ongoing population-based study in Johnston County, North Carolina. JoCo OA participants include noninstitutionalized White and Black Johnston County residents 45 years old or older with osteoarthritis.

They measured seroprevalence of Rickettsia- and Ehrlichia-specific immunoglobulin G (IgG) as well as alpha-gal immunoglobulin E (IgE) in patient samples. Only alpha-gal IgE was linked in the study with knee pain, aching, or stiffness. Antibodies to Rickettsia, Ehrlichia, and alpha-gal were not associated with radiographic, symptomatic knee osteoarthritis.

“To our knowledge,” the authors write, “this study was the first population-based seroprevalence study of SFGR, Ehrlichia, and [alpha]-gal.”

The study also found a high prevalence of TBD exposure in the cohort. More than a third (36.5%) had either an alpha-gal IgE level greater than 0.1 IU/mL, a positive test for SFGR IgG antibodies, or a positive test for Ehrlichia IgG antibodies.

Given that not every tick carries an infectious pathogen, the findings show human-tick interactions are common, they write.

“These findings suggest that substantial investment is required to examine the pathogenesis of these TBDs and interventions to reduce human-tick interactions,” the authors conclude.

This study was funded by a Creativity Hub Award from the University of North Carolina Office of the Vice Chancellor for Research. The JoCo OA project is supported in part by grants from the Association of Schools of Public Health/Centers for Disease Control and Prevention (CDC); and grants from the National Institute of Arthritis and Musculoskeletal and Skin Diseases. Authors reported grants from the National Institutes of Health, the CDC, and several pharmaceutical companies.

A new analysis supports using the smallpox antiviral tecovirimat (TPOXX/ST-246) in HIV patients showing the first symptoms of the human smallpox disease mpox (monkeypox), caused by the variola virus.

In a small prospective matched cohort analysis, people with HIV (PWH) and mpox disease who received tecovirimat within 7 days of symptom onset were 13 times less likely to experience progression, compared with PWH not prescribed tecovirimat within that window. In a matched cohort of 112 PWH, mpox disease progression occurred in 5.4% in an early tecovirimat group and in 26.8% in a late- or no-tecovirimat group, for a paired odds ratio of 13.00 (95% CI, 1.71-99.40; P = .002).

“Results of the present study suggest that tecovirimat treatment should be started early at the time of suspected mpox diagnosis in all PWH, especially in those with nonsuppressed HIV viremia or mucosal site involvement,” wrote a team led by Bruce Aldred, MD, of the Division of Infectious Diseases in the Department of Medicine at Emory University School of Medicine in Atlanta, in JAMA Internal Medicine. Early symptoms of mpox include skin rash and mucosal lesions, along with viral symptoms such as fever, headache, muscle aches, back pain, low energy, and swollen lymph nodes.

As of March 1 of last year, the United States reported more than 30,000 cases, while cases numbered more than 86,000 worldwide.

Despite a lack of effectiveness data in humans, tecovirimat was widely prescribed to PWH with mpox during the 2022 epidemic, which disproportionately affected PWH, particularly those with low CD4+ T-cell counts or severe mpox clinical manifestations who needed urgent therapy. Developed to treat smallpox, tecovirimat has antiviral activity against other orthopoxviruses, and has reduced mpox-related morbidity and mortality in animals.

Based on the animal data, approval was granted by the US Food and Drug Administration (FDA) for human mpox treatment. Dr. Aldred and colleagues undertook this cohort analysis in the absence of human data and with the postoutbreak decline in cases impeding recruitment to a full-scale clinical trial.

Study design

The preponderantly Black cohort included 112 PWH diagnosed with mpox at four Atlanta hospitals from June 1 to October 7, 2022. Patients were grouped in an early cohort receiving tecovirimat within 7 days of symptom onset or a no or late cohort (no tecovirimat or treatment more than 7 days after symptom onset. Multivariate logistic regression models identified factors associated with progression, defined as development of at least one severe CDC mpox criterion after symptom day 7.

The cohorts were then matched 1:1 using propensity scores based on the identified factors, and mpox disease progression was compared.

Of 112 PWH, 56 receive early tecovirimat and 56 received no or late treatment. In the early group, the median (interquartile range [IQR]) age was 35 (30-42) years; 54 individuals (96.4%) were cisgender men, 46 (82.1%) were Black, and 10 (17.9%) were, variously, White, American Indian, Alaska Native, Asian, Native Hawaiian or Other Pacific Islander, or of unknown race.

In the late- or no-tecovirimat group, the median (IQR) age was 36 (32-43) years; 54 (96.4%) were cisgender men, 49 (87.5%) were Black, and 7 (12.5%) were individuals of other or unknown race. Mpox disease progression occurred in 3 PWH in the early-tecovirimat group and 15 PWH (26.8%) in the late- or no-tecovirimat group.

Dr. Aldred and colleagues acknowledged that more research is needed to confirm the findings and cited several study limitations. These included the small sample size, the preponderance of Black participants, and the possibility that unmatched confounding variables could have led to the observation of fewer cases of severe disease in the early-tecovirimat cohort.

This study was supported by a grant from the Emory Center for AIDS Research. Coauthors reported grants from various institutes at the National Institutes of Health as well as from multiple pharmaceutical companies.

A new analysis supports using the smallpox antiviral tecovirimat (TPOXX/ST-246) in HIV patients showing the first symptoms of the human smallpox disease mpox (monkeypox), caused by the variola virus.

In a small prospective matched cohort analysis, people with HIV (PWH) and mpox disease who received tecovirimat within 7 days of symptom onset were 13 times less likely to experience progression, compared with PWH not prescribed tecovirimat within that window. In a matched cohort of 112 PWH, mpox disease progression occurred in 5.4% in an early tecovirimat group and in 26.8% in a late- or no-tecovirimat group, for a paired odds ratio of 13.00 (95% CI, 1.71-99.40; P = .002).

“Results of the present study suggest that tecovirimat treatment should be started early at the time of suspected mpox diagnosis in all PWH, especially in those with nonsuppressed HIV viremia or mucosal site involvement,” wrote a team led by Bruce Aldred, MD, of the Division of Infectious Diseases in the Department of Medicine at Emory University School of Medicine in Atlanta, in JAMA Internal Medicine. Early symptoms of mpox include skin rash and mucosal lesions, along with viral symptoms such as fever, headache, muscle aches, back pain, low energy, and swollen lymph nodes.

As of March 1 of last year, the United States reported more than 30,000 cases, while cases numbered more than 86,000 worldwide.

Despite a lack of effectiveness data in humans, tecovirimat was widely prescribed to PWH with mpox during the 2022 epidemic, which disproportionately affected PWH, particularly those with low CD4+ T-cell counts or severe mpox clinical manifestations who needed urgent therapy. Developed to treat smallpox, tecovirimat has antiviral activity against other orthopoxviruses, and has reduced mpox-related morbidity and mortality in animals.

Based on the animal data, approval was granted by the US Food and Drug Administration (FDA) for human mpox treatment. Dr. Aldred and colleagues undertook this cohort analysis in the absence of human data and with the postoutbreak decline in cases impeding recruitment to a full-scale clinical trial.

Study design

The preponderantly Black cohort included 112 PWH diagnosed with mpox at four Atlanta hospitals from June 1 to October 7, 2022. Patients were grouped in an early cohort receiving tecovirimat within 7 days of symptom onset or a no or late cohort (no tecovirimat or treatment more than 7 days after symptom onset. Multivariate logistic regression models identified factors associated with progression, defined as development of at least one severe CDC mpox criterion after symptom day 7.

The cohorts were then matched 1:1 using propensity scores based on the identified factors, and mpox disease progression was compared.

Of 112 PWH, 56 receive early tecovirimat and 56 received no or late treatment. In the early group, the median (interquartile range [IQR]) age was 35 (30-42) years; 54 individuals (96.4%) were cisgender men, 46 (82.1%) were Black, and 10 (17.9%) were, variously, White, American Indian, Alaska Native, Asian, Native Hawaiian or Other Pacific Islander, or of unknown race.

In the late- or no-tecovirimat group, the median (IQR) age was 36 (32-43) years; 54 (96.4%) were cisgender men, 49 (87.5%) were Black, and 7 (12.5%) were individuals of other or unknown race. Mpox disease progression occurred in 3 PWH in the early-tecovirimat group and 15 PWH (26.8%) in the late- or no-tecovirimat group.

Dr. Aldred and colleagues acknowledged that more research is needed to confirm the findings and cited several study limitations. These included the small sample size, the preponderance of Black participants, and the possibility that unmatched confounding variables could have led to the observation of fewer cases of severe disease in the early-tecovirimat cohort.

This study was supported by a grant from the Emory Center for AIDS Research. Coauthors reported grants from various institutes at the National Institutes of Health as well as from multiple pharmaceutical companies.

A new analysis supports using the smallpox antiviral tecovirimat (TPOXX/ST-246) in HIV patients showing the first symptoms of the human smallpox disease mpox (monkeypox), caused by the variola virus.

In a small prospective matched cohort analysis, people with HIV (PWH) and mpox disease who received tecovirimat within 7 days of symptom onset were 13 times less likely to experience progression, compared with PWH not prescribed tecovirimat within that window. In a matched cohort of 112 PWH, mpox disease progression occurred in 5.4% in an early tecovirimat group and in 26.8% in a late- or no-tecovirimat group, for a paired odds ratio of 13.00 (95% CI, 1.71-99.40; P = .002).

“Results of the present study suggest that tecovirimat treatment should be started early at the time of suspected mpox diagnosis in all PWH, especially in those with nonsuppressed HIV viremia or mucosal site involvement,” wrote a team led by Bruce Aldred, MD, of the Division of Infectious Diseases in the Department of Medicine at Emory University School of Medicine in Atlanta, in JAMA Internal Medicine. Early symptoms of mpox include skin rash and mucosal lesions, along with viral symptoms such as fever, headache, muscle aches, back pain, low energy, and swollen lymph nodes.

As of March 1 of last year, the United States reported more than 30,000 cases, while cases numbered more than 86,000 worldwide.

Despite a lack of effectiveness data in humans, tecovirimat was widely prescribed to PWH with mpox during the 2022 epidemic, which disproportionately affected PWH, particularly those with low CD4+ T-cell counts or severe mpox clinical manifestations who needed urgent therapy. Developed to treat smallpox, tecovirimat has antiviral activity against other orthopoxviruses, and has reduced mpox-related morbidity and mortality in animals.

Based on the animal data, approval was granted by the US Food and Drug Administration (FDA) for human mpox treatment. Dr. Aldred and colleagues undertook this cohort analysis in the absence of human data and with the postoutbreak decline in cases impeding recruitment to a full-scale clinical trial.

Study design

The preponderantly Black cohort included 112 PWH diagnosed with mpox at four Atlanta hospitals from June 1 to October 7, 2022. Patients were grouped in an early cohort receiving tecovirimat within 7 days of symptom onset or a no or late cohort (no tecovirimat or treatment more than 7 days after symptom onset. Multivariate logistic regression models identified factors associated with progression, defined as development of at least one severe CDC mpox criterion after symptom day 7.

The cohorts were then matched 1:1 using propensity scores based on the identified factors, and mpox disease progression was compared.

Of 112 PWH, 56 receive early tecovirimat and 56 received no or late treatment. In the early group, the median (interquartile range [IQR]) age was 35 (30-42) years; 54 individuals (96.4%) were cisgender men, 46 (82.1%) were Black, and 10 (17.9%) were, variously, White, American Indian, Alaska Native, Asian, Native Hawaiian or Other Pacific Islander, or of unknown race.

In the late- or no-tecovirimat group, the median (IQR) age was 36 (32-43) years; 54 (96.4%) were cisgender men, 49 (87.5%) were Black, and 7 (12.5%) were individuals of other or unknown race. Mpox disease progression occurred in 3 PWH in the early-tecovirimat group and 15 PWH (26.8%) in the late- or no-tecovirimat group.

Dr. Aldred and colleagues acknowledged that more research is needed to confirm the findings and cited several study limitations. These included the small sample size, the preponderance of Black participants, and the possibility that unmatched confounding variables could have led to the observation of fewer cases of severe disease in the early-tecovirimat cohort.

This study was supported by a grant from the Emory Center for AIDS Research. Coauthors reported grants from various institutes at the National Institutes of Health as well as from multiple pharmaceutical companies.

A resurgence of mpox this summer could be larger than last year’s caseload, the Centers for Disease Control and Prevention said in a warning to public health officials this week.

“The outbreak is not over,” the CDC alert stated, noting that springtime and summertime gatherings and festivals could lead to renewed virus spread. A new cluster of 13 cases is being investigated in Chicago, all among men, and four among people who recently traveled to New York City, New Orleans, or Mexico. 

Mpox, formerly called monkeypox, is a virus that causes a rash and sometimes flulike symptoms. It is most often transmitted through sexual contact, but it can also be spread in nonsexual ways that involve contact with skin lesions or with saliva or upper respiratory secretions like snot or mucus, the CDC says. Most cases in the United States have been among gay or bisexual men, men who have sex with men, and transgender people.

Last year, the U.S. government declared mpox a public health emergency as cases peaked at 460 per day in August, infecting more than 30,000 people and killing 42 people. Public health officials worked to quickly distribute vaccinations to people at high risk for contracting the virus. The CDC says 23% of people most at risk of getting mpox have been vaccinated.

The agency advises that people be vaccinated for mpox based on their potential exposure risk. Vaccination does not necessarily prevent infection but can lessen the severity of symptoms. Nine of the men who were recently infected in Chicago were fully vaccinated.

“It’s important to remember that vaccines, while incredibly helpful, are not our only way to reduce the risk of contracting mpox,” Richard Silvera, MD, MPH, of the department of infectious diseases at Icahn School of Medicine at Mount Sinai, New York, told ABC News. 

Other ways to reduce risk are “things like avoiding social and sexual contact if you have new skin lesions and asking your intimate contacts if they are experiencing symptoms or new skin changes,” Dr. Silvera said.

A version of this article first appeared on WebMD.com.

A resurgence of mpox this summer could be larger than last year’s caseload, the Centers for Disease Control and Prevention said in a warning to public health officials this week.

“The outbreak is not over,” the CDC alert stated, noting that springtime and summertime gatherings and festivals could lead to renewed virus spread. A new cluster of 13 cases is being investigated in Chicago, all among men, and four among people who recently traveled to New York City, New Orleans, or Mexico. 

Mpox, formerly called monkeypox, is a virus that causes a rash and sometimes flulike symptoms. It is most often transmitted through sexual contact, but it can also be spread in nonsexual ways that involve contact with skin lesions or with saliva or upper respiratory secretions like snot or mucus, the CDC says. Most cases in the United States have been among gay or bisexual men, men who have sex with men, and transgender people.

Last year, the U.S. government declared mpox a public health emergency as cases peaked at 460 per day in August, infecting more than 30,000 people and killing 42 people. Public health officials worked to quickly distribute vaccinations to people at high risk for contracting the virus. The CDC says 23% of people most at risk of getting mpox have been vaccinated.

The agency advises that people be vaccinated for mpox based on their potential exposure risk. Vaccination does not necessarily prevent infection but can lessen the severity of symptoms. Nine of the men who were recently infected in Chicago were fully vaccinated.

“It’s important to remember that vaccines, while incredibly helpful, are not our only way to reduce the risk of contracting mpox,” Richard Silvera, MD, MPH, of the department of infectious diseases at Icahn School of Medicine at Mount Sinai, New York, told ABC News. 

Other ways to reduce risk are “things like avoiding social and sexual contact if you have new skin lesions and asking your intimate contacts if they are experiencing symptoms or new skin changes,” Dr. Silvera said.

A version of this article first appeared on WebMD.com.

A resurgence of mpox this summer could be larger than last year’s caseload, the Centers for Disease Control and Prevention said in a warning to public health officials this week.

“The outbreak is not over,” the CDC alert stated, noting that springtime and summertime gatherings and festivals could lead to renewed virus spread. A new cluster of 13 cases is being investigated in Chicago, all among men, and four among people who recently traveled to New York City, New Orleans, or Mexico. 

Mpox, formerly called monkeypox, is a virus that causes a rash and sometimes flulike symptoms. It is most often transmitted through sexual contact, but it can also be spread in nonsexual ways that involve contact with skin lesions or with saliva or upper respiratory secretions like snot or mucus, the CDC says. Most cases in the United States have been among gay or bisexual men, men who have sex with men, and transgender people.

Last year, the U.S. government declared mpox a public health emergency as cases peaked at 460 per day in August, infecting more than 30,000 people and killing 42 people. Public health officials worked to quickly distribute vaccinations to people at high risk for contracting the virus. The CDC says 23% of people most at risk of getting mpox have been vaccinated.

The agency advises that people be vaccinated for mpox based on their potential exposure risk. Vaccination does not necessarily prevent infection but can lessen the severity of symptoms. Nine of the men who were recently infected in Chicago were fully vaccinated.

“It’s important to remember that vaccines, while incredibly helpful, are not our only way to reduce the risk of contracting mpox,” Richard Silvera, MD, MPH, of the department of infectious diseases at Icahn School of Medicine at Mount Sinai, New York, told ABC News. 

Other ways to reduce risk are “things like avoiding social and sexual contact if you have new skin lesions and asking your intimate contacts if they are experiencing symptoms or new skin changes,” Dr. Silvera said.

A version of this article first appeared on WebMD.com.

What do green monkeys, fruit bats, and python caves all have in common? All have been implicated in outbreaks as transmission sources of the rare but deadly Marburg virus. Marburg virus is in the same Filoviridae family of highly pathogenic RNA viruses as Ebola virus, and similarly can cause a rapidly progressive and fatal viral hemorrhagic fever.

In the first reported Marburg outbreak in 1967, laboratory workers in Marburg and Frankfurt, Germany, and in Belgrade, Yugoslavia, developed severe febrile illnesses with massive hemorrhage and multiorgan system dysfunction after contact with infected African green monkeys imported from Uganda. Since the first discovery of Marburg virus, there have been over 14 Marburg virus disease (MVD) outbreaks worldwide with nearly 600 cases and case fatality rates of 23%-90%.

The majority of MVD outbreaks have occurred in sub-Saharan Africa, and primarily in three African countries: Angola, the Democratic Republic of Congo, and Uganda. In sub-Saharan Africa, these sporadic outbreaks have had high case fatality rates (up to 80%-90%) and been linked to human exposure to the oral secretions or urinary/fecal droppings of Egyptian fruit bats (Rousettus aegyptiacus), the animal reservoir for Marburg virus. These exposures have primarily occurred among miners or tourists frequenting bat-infested mines or caves, including Uganda’s python cave, where Centers for Disease Control and Prevention investigators have conducted ecological studies on Marburg-infected bats. Person-to-person transmission occurs from direct contact with the blood or bodily fluids of an infected person or contact with a contaminated object (for example, unsterilized needles and syringes in a large nosocomial outbreak in Angola).

On April 6, 2023, the CDC issued a Health Advisory for U.S. clinicians and public health departments regarding two separate MVD outbreaks in Equatorial Guinea and Tanzania. These first-ever MVD outbreaks in both West and East African countries appear to be epidemiologically unrelated. As of March 24, 2023, in Equatorial Guinea, a total of 15 confirmed cases, including 11 deaths, and 23 probable cases, all deceased, have been identified in multiple districts since the outbreak declaration in February 2023. In Tanzania, a total of eight cases, including five deaths, have been reported among villagers in a northwest region since the outbreak declaration in March 2023. While so far cases in the Tanzania MVD outbreak have been epidemiologically linked, in Equatorial Guinea some cases have no identified epidemiological links, raising concern for ongoing community spread.

To date, no cases in these outbreaks have been reported in the United States or outside the affected countries. Overall, the risk of MVD in nonendemic countries, like the United States, is low but there is still a risk of importation. As of May 2, 2023, CDC has issued a Level 2 travel alert (practice enhanced precautions) for Marburg in Equatorial Guinea and a Level 1 travel watch (practice usual precautions) for Marburg in Tanzania. Travelers to these countries are advised to avoid nonessential travel to areas with active outbreaks and practice preventative measures, including avoiding contact with sick people, blood and bodily fluids, dead bodies, fruit bats, and nonhuman primates. International travelers returning to the United States from these countries are advised to self-monitor for Marburg symptoms during travel and for 21 days after country departure. Travelers who develop signs or symptoms of MVD should immediately self-isolate and contact their local health department or clinician.

So, how should clinicians manage such return travelers? In the setting of these new MVD outbreaks in sub-Saharan Africa, what do U.S. clinicians need to know? Clinicians should consider MVD in the differential diagnosis of ill patients with a compatible exposure history and clinical presentation. A detailed exposure history should be obtained to determine if patients have been to an area with an active MVD outbreak during their incubation period (in the past 21 days), had concerning epidemiologic risk factors (for example, presence at funerals, health care facilities, in mines/caves) while in the affected area, and/or had contact with a suspected or confirmed MVD case.

Clinical diagnosis of MVD is challenging as the initial dry symptoms of infection are nonspecific (fever, influenza-like illness, malaise, anorexia, etc.) and can resemble other febrile infectious illnesses. Similarly, presenting alternative or concurrent infections, particularly in febrile return travelers, include malaria, Lassa fever, typhoid, and measles. From these nonspecific symptoms, patients with MVD can then progress to the more severe wet symptoms (for example, vomiting, diarrhea, and bleeding). Common clinical features of MVD have been described based on the clinical presentation and course of cases in MVD outbreaks. Notably, in the original Marburg outbreak, maculopapular rash and conjunctival injection were early patient symptoms and most patient deaths occurred during the second week of illness progression.

Supportive care, including aggressive fluid replacement, is the mainstay of therapy for MVD. Currently, there are no Food and Drug Administration–approved antiviral treatments or vaccines for Marburg virus. Despite their viral similarities, vaccines against Ebola virus have not been shown to be protective against Marburg virus. Marburg virus vaccine development is ongoing, with a few promising candidate vaccines in early phase 1 and 2 clinical trials. In 2022, in response to MVD outbreaks in Ghana and Guinea, the World Health Organization convened an international Marburg virus vaccine consortium which is working to promote global research collaboration for more rapid vaccine development.

In the absence of definitive therapies, early identification of patients with suspected MVD is critical for preventing the spread of infection to close contacts. Like Ebola virus–infected patients, only symptomatic MVD patients are infectious and all patients with suspected MVD should be isolated in a private room and cared for in accordance with infection control procedures. As MVD is a nationally notifiable disease, suspected cases should be reported to local or state health departments as per jurisdictional requirements. Clinicians should also consult with their local or state health department and CDC for guidance on testing patients with suspected MVD and consider prompt evaluation for other infectious etiologies in the patient’s differential diagnosis. Comprehensive guidance for clinicians on screening and diagnosing patients with MVD is available on the CDC website at https://www.cdc.gov/vhf/marburg/index.html.

Dr. Appiah (she/her) is a medical epidemiologist in the division of global migration and quarantine at the CDC. Dr. Appiah holds adjunct faculty appointment in the division of infectious diseases at Emory University, Atlanta. She also holds a commission in the U.S. Public Health Service and is a resident advisor, Uganda, U.S. President’s Malaria Initiative, at the CDC.

What do green monkeys, fruit bats, and python caves all have in common? All have been implicated in outbreaks as transmission sources of the rare but deadly Marburg virus. Marburg virus is in the same Filoviridae family of highly pathogenic RNA viruses as Ebola virus, and similarly can cause a rapidly progressive and fatal viral hemorrhagic fever.

In the first reported Marburg outbreak in 1967, laboratory workers in Marburg and Frankfurt, Germany, and in Belgrade, Yugoslavia, developed severe febrile illnesses with massive hemorrhage and multiorgan system dysfunction after contact with infected African green monkeys imported from Uganda. Since the first discovery of Marburg virus, there have been over 14 Marburg virus disease (MVD) outbreaks worldwide with nearly 600 cases and case fatality rates of 23%-90%.

The majority of MVD outbreaks have occurred in sub-Saharan Africa, and primarily in three African countries: Angola, the Democratic Republic of Congo, and Uganda. In sub-Saharan Africa, these sporadic outbreaks have had high case fatality rates (up to 80%-90%) and been linked to human exposure to the oral secretions or urinary/fecal droppings of Egyptian fruit bats (Rousettus aegyptiacus), the animal reservoir for Marburg virus. These exposures have primarily occurred among miners or tourists frequenting bat-infested mines or caves, including Uganda’s python cave, where Centers for Disease Control and Prevention investigators have conducted ecological studies on Marburg-infected bats. Person-to-person transmission occurs from direct contact with the blood or bodily fluids of an infected person or contact with a contaminated object (for example, unsterilized needles and syringes in a large nosocomial outbreak in Angola).

On April 6, 2023, the CDC issued a Health Advisory for U.S. clinicians and public health departments regarding two separate MVD outbreaks in Equatorial Guinea and Tanzania. These first-ever MVD outbreaks in both West and East African countries appear to be epidemiologically unrelated. As of March 24, 2023, in Equatorial Guinea, a total of 15 confirmed cases, including 11 deaths, and 23 probable cases, all deceased, have been identified in multiple districts since the outbreak declaration in February 2023. In Tanzania, a total of eight cases, including five deaths, have been reported among villagers in a northwest region since the outbreak declaration in March 2023. While so far cases in the Tanzania MVD outbreak have been epidemiologically linked, in Equatorial Guinea some cases have no identified epidemiological links, raising concern for ongoing community spread.

To date, no cases in these outbreaks have been reported in the United States or outside the affected countries. Overall, the risk of MVD in nonendemic countries, like the United States, is low but there is still a risk of importation. As of May 2, 2023, CDC has issued a Level 2 travel alert (practice enhanced precautions) for Marburg in Equatorial Guinea and a Level 1 travel watch (practice usual precautions) for Marburg in Tanzania. Travelers to these countries are advised to avoid nonessential travel to areas with active outbreaks and practice preventative measures, including avoiding contact with sick people, blood and bodily fluids, dead bodies, fruit bats, and nonhuman primates. International travelers returning to the United States from these countries are advised to self-monitor for Marburg symptoms during travel and for 21 days after country departure. Travelers who develop signs or symptoms of MVD should immediately self-isolate and contact their local health department or clinician.

So, how should clinicians manage such return travelers? In the setting of these new MVD outbreaks in sub-Saharan Africa, what do U.S. clinicians need to know? Clinicians should consider MVD in the differential diagnosis of ill patients with a compatible exposure history and clinical presentation. A detailed exposure history should be obtained to determine if patients have been to an area with an active MVD outbreak during their incubation period (in the past 21 days), had concerning epidemiologic risk factors (for example, presence at funerals, health care facilities, in mines/caves) while in the affected area, and/or had contact with a suspected or confirmed MVD case.

Clinical diagnosis of MVD is challenging as the initial dry symptoms of infection are nonspecific (fever, influenza-like illness, malaise, anorexia, etc.) and can resemble other febrile infectious illnesses. Similarly, presenting alternative or concurrent infections, particularly in febrile return travelers, include malaria, Lassa fever, typhoid, and measles. From these nonspecific symptoms, patients with MVD can then progress to the more severe wet symptoms (for example, vomiting, diarrhea, and bleeding). Common clinical features of MVD have been described based on the clinical presentation and course of cases in MVD outbreaks. Notably, in the original Marburg outbreak, maculopapular rash and conjunctival injection were early patient symptoms and most patient deaths occurred during the second week of illness progression.

Supportive care, including aggressive fluid replacement, is the mainstay of therapy for MVD. Currently, there are no Food and Drug Administration–approved antiviral treatments or vaccines for Marburg virus. Despite their viral similarities, vaccines against Ebola virus have not been shown to be protective against Marburg virus. Marburg virus vaccine development is ongoing, with a few promising candidate vaccines in early phase 1 and 2 clinical trials. In 2022, in response to MVD outbreaks in Ghana and Guinea, the World Health Organization convened an international Marburg virus vaccine consortium which is working to promote global research collaboration for more rapid vaccine development.

In the absence of definitive therapies, early identification of patients with suspected MVD is critical for preventing the spread of infection to close contacts. Like Ebola virus–infected patients, only symptomatic MVD patients are infectious and all patients with suspected MVD should be isolated in a private room and cared for in accordance with infection control procedures. As MVD is a nationally notifiable disease, suspected cases should be reported to local or state health departments as per jurisdictional requirements. Clinicians should also consult with their local or state health department and CDC for guidance on testing patients with suspected MVD and consider prompt evaluation for other infectious etiologies in the patient’s differential diagnosis. Comprehensive guidance for clinicians on screening and diagnosing patients with MVD is available on the CDC website at https://www.cdc.gov/vhf/marburg/index.html.

Dr. Appiah (she/her) is a medical epidemiologist in the division of global migration and quarantine at the CDC. Dr. Appiah holds adjunct faculty appointment in the division of infectious diseases at Emory University, Atlanta. She also holds a commission in the U.S. Public Health Service and is a resident advisor, Uganda, U.S. President’s Malaria Initiative, at the CDC.

What do green monkeys, fruit bats, and python caves all have in common? All have been implicated in outbreaks as transmission sources of the rare but deadly Marburg virus. Marburg virus is in the same Filoviridae family of highly pathogenic RNA viruses as Ebola virus, and similarly can cause a rapidly progressive and fatal viral hemorrhagic fever.

In the first reported Marburg outbreak in 1967, laboratory workers in Marburg and Frankfurt, Germany, and in Belgrade, Yugoslavia, developed severe febrile illnesses with massive hemorrhage and multiorgan system dysfunction after contact with infected African green monkeys imported from Uganda. Since the first discovery of Marburg virus, there have been over 14 Marburg virus disease (MVD) outbreaks worldwide with nearly 600 cases and case fatality rates of 23%-90%.

The majority of MVD outbreaks have occurred in sub-Saharan Africa, and primarily in three African countries: Angola, the Democratic Republic of Congo, and Uganda. In sub-Saharan Africa, these sporadic outbreaks have had high case fatality rates (up to 80%-90%) and been linked to human exposure to the oral secretions or urinary/fecal droppings of Egyptian fruit bats (Rousettus aegyptiacus), the animal reservoir for Marburg virus. These exposures have primarily occurred among miners or tourists frequenting bat-infested mines or caves, including Uganda’s python cave, where Centers for Disease Control and Prevention investigators have conducted ecological studies on Marburg-infected bats. Person-to-person transmission occurs from direct contact with the blood or bodily fluids of an infected person or contact with a contaminated object (for example, unsterilized needles and syringes in a large nosocomial outbreak in Angola).

On April 6, 2023, the CDC issued a Health Advisory for U.S. clinicians and public health departments regarding two separate MVD outbreaks in Equatorial Guinea and Tanzania. These first-ever MVD outbreaks in both West and East African countries appear to be epidemiologically unrelated. As of March 24, 2023, in Equatorial Guinea, a total of 15 confirmed cases, including 11 deaths, and 23 probable cases, all deceased, have been identified in multiple districts since the outbreak declaration in February 2023. In Tanzania, a total of eight cases, including five deaths, have been reported among villagers in a northwest region since the outbreak declaration in March 2023. While so far cases in the Tanzania MVD outbreak have been epidemiologically linked, in Equatorial Guinea some cases have no identified epidemiological links, raising concern for ongoing community spread.

To date, no cases in these outbreaks have been reported in the United States or outside the affected countries. Overall, the risk of MVD in nonendemic countries, like the United States, is low but there is still a risk of importation. As of May 2, 2023, CDC has issued a Level 2 travel alert (practice enhanced precautions) for Marburg in Equatorial Guinea and a Level 1 travel watch (practice usual precautions) for Marburg in Tanzania. Travelers to these countries are advised to avoid nonessential travel to areas with active outbreaks and practice preventative measures, including avoiding contact with sick people, blood and bodily fluids, dead bodies, fruit bats, and nonhuman primates. International travelers returning to the United States from these countries are advised to self-monitor for Marburg symptoms during travel and for 21 days after country departure. Travelers who develop signs or symptoms of MVD should immediately self-isolate and contact their local health department or clinician.

So, how should clinicians manage such return travelers? In the setting of these new MVD outbreaks in sub-Saharan Africa, what do U.S. clinicians need to know? Clinicians should consider MVD in the differential diagnosis of ill patients with a compatible exposure history and clinical presentation. A detailed exposure history should be obtained to determine if patients have been to an area with an active MVD outbreak during their incubation period (in the past 21 days), had concerning epidemiologic risk factors (for example, presence at funerals, health care facilities, in mines/caves) while in the affected area, and/or had contact with a suspected or confirmed MVD case.

Clinical diagnosis of MVD is challenging as the initial dry symptoms of infection are nonspecific (fever, influenza-like illness, malaise, anorexia, etc.) and can resemble other febrile infectious illnesses. Similarly, presenting alternative or concurrent infections, particularly in febrile return travelers, include malaria, Lassa fever, typhoid, and measles. From these nonspecific symptoms, patients with MVD can then progress to the more severe wet symptoms (for example, vomiting, diarrhea, and bleeding). Common clinical features of MVD have been described based on the clinical presentation and course of cases in MVD outbreaks. Notably, in the original Marburg outbreak, maculopapular rash and conjunctival injection were early patient symptoms and most patient deaths occurred during the second week of illness progression.

Supportive care, including aggressive fluid replacement, is the mainstay of therapy for MVD. Currently, there are no Food and Drug Administration–approved antiviral treatments or vaccines for Marburg virus. Despite their viral similarities, vaccines against Ebola virus have not been shown to be protective against Marburg virus. Marburg virus vaccine development is ongoing, with a few promising candidate vaccines in early phase 1 and 2 clinical trials. In 2022, in response to MVD outbreaks in Ghana and Guinea, the World Health Organization convened an international Marburg virus vaccine consortium which is working to promote global research collaboration for more rapid vaccine development.

In the absence of definitive therapies, early identification of patients with suspected MVD is critical for preventing the spread of infection to close contacts. Like Ebola virus–infected patients, only symptomatic MVD patients are infectious and all patients with suspected MVD should be isolated in a private room and cared for in accordance with infection control procedures. As MVD is a nationally notifiable disease, suspected cases should be reported to local or state health departments as per jurisdictional requirements. Clinicians should also consult with their local or state health department and CDC for guidance on testing patients with suspected MVD and consider prompt evaluation for other infectious etiologies in the patient’s differential diagnosis. Comprehensive guidance for clinicians on screening and diagnosing patients with MVD is available on the CDC website at https://www.cdc.gov/vhf/marburg/index.html.

Dr. Appiah (she/her) is a medical epidemiologist in the division of global migration and quarantine at the CDC. Dr. Appiah holds adjunct faculty appointment in the division of infectious diseases at Emory University, Atlanta. She also holds a commission in the U.S. Public Health Service and is a resident advisor, Uganda, U.S. President’s Malaria Initiative, at the CDC.

Clinicians in the United States are reporting more cases of invasive group A streptococcal infection (iGAS) in children, according to an alert from the Centers for Disease Control and Prevention. These infections are rare but can be deadly, and they can affect adults as well as children.

Health care providers should consider this bacterial infection as a possible cause of severe illness in children and adults, including those with recent or co-occurring viral respiratory infections, the agency advised in a Dec. 22 alert.

In some cases, iGAS manifests as persistent or worsening symptoms after a patient with a known viral infection initially starts to show signs of improvement, according to the agency.

In November, the CDC was notified about a possible increase in cases of pediatric iGAS at a hospital in Colorado. Since then, two surveillance systems – the Infectious Diseases Society of America’s Emerging Infections Network and the CDC’s Active Bacterial Core Surveillance System – have detected potential increases in pediatric iGAS cases in other states.

The uptick has coincided with “increased circulation of respiratory syncytial virus (RSV), influenza viruses, SARS-CoV-2, and other respiratory viruses,” the advisory stated. “While the overall number of cases has remained relatively low and iGAS infections remain rare in children, [the] CDC is investigating these reports.”
 

Not just strep throat

Group A Streptococcus bacteria can cause strep throat and infections in skin and soft tissue. The pathogens also can lead to uncommon but severe diseases, such as sepsis, streptococcal toxic shock syndrome, and necrotizing fasciitis, according to the CDC. The severe illnesses “are associated with high mortality rates and require immediate treatment, including appropriate antibiotic therapy,” the agency said.

Groups at higher risk for iGAS include people aged 65 years or older, American Indian and Alaska Native populations, residents of long-term care facilities, those with wounds or skin disease, people who inject drugs, and people experiencing homelessness.

People with medical conditions such as diabetes, cancer, immunosuppression, and chronic kidney, heart, or respiratory disease also are at increased risk.

Invasive strep A infections initially decreased during the COVID-19 pandemic amid measures to reduce the spread of disease, such as masking and social distancing. But since September, monthly cases have exceeded those in 2020 and 2021. “It is too early to determine whether this rise is beyond what would be expected for pre-COVID” seasonal patterns, the CDC said.
 

Recommendations

Because iGAS can occur after the flu or chickenpox, health care providers should offer influenza and varicella vaccinations to all eligible people who are not up to date with their vaccines.

In addition, clinicians should educate patients about symptoms of iGAS that require urgent medical attention, including necrotizing fasciitis, cellulitis, and toxic shock syndrome.

They also should obtain cultures for suspected cases of iGAS as clinically indicated, follow guidelines for the diagnosis and treatment of strep throat, and be aware of alternative ways to treat strep throat in children amid a shortage of amoxicillin suspension.

Researchers have reported more cases of iGAS in the United Kingdom this year, as well. According to the UK Health Security Agency, 74 deaths, including 16 children, in England have been attributed to iGAS since September.

“We know that this is concerning for parents, but I want to stress that while we are seeing an increase in cases in children, this remains very uncommon,” UKHSA Deputy Director Colin Brown said in a news release. “There are lots of winter bugs circulating that can make your child feel unwell that mostly aren’t cause for alarm. However, make sure you talk to a health professional if your child is getting worse after a bout of scarlet fever, a sore throat, or respiratory infection.”

A fever that doesn’t resolve, dehydration, extreme tiredness, and difficulty breathing are signs to watch out for, Dr. Brown said.

A version of this article first appeared on Medscape.com.

Clinicians in the United States are reporting more cases of invasive group A streptococcal infection (iGAS) in children, according to an alert from the Centers for Disease Control and Prevention. These infections are rare but can be deadly, and they can affect adults as well as children.

Health care providers should consider this bacterial infection as a possible cause of severe illness in children and adults, including those with recent or co-occurring viral respiratory infections, the agency advised in a Dec. 22 alert.

In some cases, iGAS manifests as persistent or worsening symptoms after a patient with a known viral infection initially starts to show signs of improvement, according to the agency.

In November, the CDC was notified about a possible increase in cases of pediatric iGAS at a hospital in Colorado. Since then, two surveillance systems – the Infectious Diseases Society of America’s Emerging Infections Network and the CDC’s Active Bacterial Core Surveillance System – have detected potential increases in pediatric iGAS cases in other states.

The uptick has coincided with “increased circulation of respiratory syncytial virus (RSV), influenza viruses, SARS-CoV-2, and other respiratory viruses,” the advisory stated. “While the overall number of cases has remained relatively low and iGAS infections remain rare in children, [the] CDC is investigating these reports.”
 

Not just strep throat

Group A Streptococcus bacteria can cause strep throat and infections in skin and soft tissue. The pathogens also can lead to uncommon but severe diseases, such as sepsis, streptococcal toxic shock syndrome, and necrotizing fasciitis, according to the CDC. The severe illnesses “are associated with high mortality rates and require immediate treatment, including appropriate antibiotic therapy,” the agency said.

Groups at higher risk for iGAS include people aged 65 years or older, American Indian and Alaska Native populations, residents of long-term care facilities, those with wounds or skin disease, people who inject drugs, and people experiencing homelessness.

People with medical conditions such as diabetes, cancer, immunosuppression, and chronic kidney, heart, or respiratory disease also are at increased risk.

Invasive strep A infections initially decreased during the COVID-19 pandemic amid measures to reduce the spread of disease, such as masking and social distancing. But since September, monthly cases have exceeded those in 2020 and 2021. “It is too early to determine whether this rise is beyond what would be expected for pre-COVID” seasonal patterns, the CDC said.
 

Recommendations

Because iGAS can occur after the flu or chickenpox, health care providers should offer influenza and varicella vaccinations to all eligible people who are not up to date with their vaccines.

In addition, clinicians should educate patients about symptoms of iGAS that require urgent medical attention, including necrotizing fasciitis, cellulitis, and toxic shock syndrome.

They also should obtain cultures for suspected cases of iGAS as clinically indicated, follow guidelines for the diagnosis and treatment of strep throat, and be aware of alternative ways to treat strep throat in children amid a shortage of amoxicillin suspension.

Researchers have reported more cases of iGAS in the United Kingdom this year, as well. According to the UK Health Security Agency, 74 deaths, including 16 children, in England have been attributed to iGAS since September.

“We know that this is concerning for parents, but I want to stress that while we are seeing an increase in cases in children, this remains very uncommon,” UKHSA Deputy Director Colin Brown said in a news release. “There are lots of winter bugs circulating that can make your child feel unwell that mostly aren’t cause for alarm. However, make sure you talk to a health professional if your child is getting worse after a bout of scarlet fever, a sore throat, or respiratory infection.”

A fever that doesn’t resolve, dehydration, extreme tiredness, and difficulty breathing are signs to watch out for, Dr. Brown said.

A version of this article first appeared on Medscape.com.

Clinicians in the United States are reporting more cases of invasive group A streptococcal infection (iGAS) in children, according to an alert from the Centers for Disease Control and Prevention. These infections are rare but can be deadly, and they can affect adults as well as children.

Health care providers should consider this bacterial infection as a possible cause of severe illness in children and adults, including those with recent or co-occurring viral respiratory infections, the agency advised in a Dec. 22 alert.

In some cases, iGAS manifests as persistent or worsening symptoms after a patient with a known viral infection initially starts to show signs of improvement, according to the agency.

In November, the CDC was notified about a possible increase in cases of pediatric iGAS at a hospital in Colorado. Since then, two surveillance systems – the Infectious Diseases Society of America’s Emerging Infections Network and the CDC’s Active Bacterial Core Surveillance System – have detected potential increases in pediatric iGAS cases in other states.

The uptick has coincided with “increased circulation of respiratory syncytial virus (RSV), influenza viruses, SARS-CoV-2, and other respiratory viruses,” the advisory stated. “While the overall number of cases has remained relatively low and iGAS infections remain rare in children, [the] CDC is investigating these reports.”
 

Not just strep throat

Group A Streptococcus bacteria can cause strep throat and infections in skin and soft tissue. The pathogens also can lead to uncommon but severe diseases, such as sepsis, streptococcal toxic shock syndrome, and necrotizing fasciitis, according to the CDC. The severe illnesses “are associated with high mortality rates and require immediate treatment, including appropriate antibiotic therapy,” the agency said.

Groups at higher risk for iGAS include people aged 65 years or older, American Indian and Alaska Native populations, residents of long-term care facilities, those with wounds or skin disease, people who inject drugs, and people experiencing homelessness.

People with medical conditions such as diabetes, cancer, immunosuppression, and chronic kidney, heart, or respiratory disease also are at increased risk.

Invasive strep A infections initially decreased during the COVID-19 pandemic amid measures to reduce the spread of disease, such as masking and social distancing. But since September, monthly cases have exceeded those in 2020 and 2021. “It is too early to determine whether this rise is beyond what would be expected for pre-COVID” seasonal patterns, the CDC said.
 

Recommendations

Because iGAS can occur after the flu or chickenpox, health care providers should offer influenza and varicella vaccinations to all eligible people who are not up to date with their vaccines.

In addition, clinicians should educate patients about symptoms of iGAS that require urgent medical attention, including necrotizing fasciitis, cellulitis, and toxic shock syndrome.

They also should obtain cultures for suspected cases of iGAS as clinically indicated, follow guidelines for the diagnosis and treatment of strep throat, and be aware of alternative ways to treat strep throat in children amid a shortage of amoxicillin suspension.

Researchers have reported more cases of iGAS in the United Kingdom this year, as well. According to the UK Health Security Agency, 74 deaths, including 16 children, in England have been attributed to iGAS since September.

“We know that this is concerning for parents, but I want to stress that while we are seeing an increase in cases in children, this remains very uncommon,” UKHSA Deputy Director Colin Brown said in a news release. “There are lots of winter bugs circulating that can make your child feel unwell that mostly aren’t cause for alarm. However, make sure you talk to a health professional if your child is getting worse after a bout of scarlet fever, a sore throat, or respiratory infection.”

A fever that doesn’t resolve, dehydration, extreme tiredness, and difficulty breathing are signs to watch out for, Dr. Brown said.

A version of this article first appeared on Medscape.com.

Monkeypox virus infections in children and adolescents in the United States are rare, and young patients with known infections have all recovered, according to a study from the Centers for Disease Control and Prevention.

In addition, evidence suggests that secondary transmission in schools or childcare facilities may be unlikely.

The study was the first comprehensive study on the impact of monkeypox on children during the 2022 outbreak, according to a statement emailed to this news organization from the California Department of Public Health, one of the state health departments that partnered with the CDC to share information.

News of low infection rates and relatively mild disease was welcome to clinicians, who had braced for severe findings on the basis of sparse prior data, according to Peter Chin-Hong, MD, a professor of medicine and an infectious diseases physician at the University of California, San Francisco.

“We were on heightened alert that kids may do poorly,” said Dr. Chin-Hong, who was not involved in the study but who cared for monkeypox patients during the outbreak. “I think this study is reassuring.

“The other silver lining about it is that most of the kids got infected in the household setting from ways that you would expect them to get [infected],” Dr. Chin-Hong said in an interview.

However, Black and Hispanic children were more likely to contract the disease, underscoring troubling inequities.

“Early on, individuals of color were much less likely to be able to successfully access vaccination,” said first author Ian Hennessee, PhD, MPH, an epidemic intelligence service officer with the CDC and a member of the Special Case Investigation Unit of the Multinational Monkeypox Response Team at the CDC. “We think those kinds of structural inequities really trickled down towards the children and adolescents that have been affected by this outbreak.”

The study was published  in Morbidity and Mortality Weekly Report.
 

A nationwide look at the data

The researchers discussed 83 children and adolescents with monkeypox who came to the CDC’s attention between May 17 and Sept. 24, 2022.

The 83 cases represent 0.3% of the 25,038 reported monkeypox cases in the United States over that period. Of the 28 children aged 12 years or younger, 18 (64%) were boys. Sixteen children were younger than 4 years.

Exposure data were available for 20 (71%) of those aged 0-12. In that group, 19 were exposed at home; 17 cases were due to routine skin-to-skin contact with a household caregiver; and one case was suspected to be caused by fomites (such as a shared towel). Exposure information was unavailable for the remaining case.

Most of the children experienced lesions on the trunk. No lesions were anogenital. Two patients in the youngest age group were hospitalized because of widespread rash that involved the eyelids, and a patient in the 5- to 12-year-old group was hospitalized because of periorbital cellulitis and conjunctivitis.

Among those aged 13-17, there were 55 cases. Of these patients, 89% were boys. Exposure data were available for 35 (64%). In 32 of these patients, the infection occurred from presumed sexual contact. Twenty-three of those adolescents reported male-to-male sexual contact. No case was found to be connected with sexual abuse.

Lesions in the adolescents were mostly truncal or anogenital. Six in this group were hospitalized, and all of them recovered. One adolescent was found to be HIV positive.

Black and Hispanic children accounted for 47% and 35% of all cases, respectively.

Eleven percent of all the children and adolescents were hospitalized, and none received intensive care.

Treatments, when given, included the antiviral drug tecovirimat, intravenous vaccinia immune globulin, and topical trifluridine. There were no deaths.

Ten symptomatic patients attended school or daycare. Among these patients, no secondary transmissions were found to have occurred. Some contacts were offered the JYNNEOS monkeypox vaccine as postexposure prophylaxis.

Limitations of the study included potentially overlooked cases. Data were collected through routine surveillance, children frequently experience rashes, and access to testing has been a challenge, Dr. Hennessee explained.

In addition, data on exposure characteristics were missing for some children.
 

Inequities and the risks of being judged

The outbreak in the United States has eased in recent months. However, though uncommon in children, monkeypox has affected some racial groups disproportionately.

“Especially in the later course of the outbreak, the majority of cases were among Black and Hispanic individuals,” said co-author Rachel E. Harold, MD, an infectious diseases specialist and supervisory medical officer with the District of Columbia Department of Health’s HIV/AIDS, Hepatitis, STDs, and TB Administration.

“Unfortunately, the pediatric cases do reflect the outbreak overall,” she told this news organization.

Dr. Harold noted there have been efforts in D.C. and other jurisdictions, as well as by the White House monkeypox response team, to reach populations at greatest risk and that they were “really trying to make vaccine available to people of color.”

Vaccination clinics often popped up in unexpected locations at short notice, and that made it hard for some people to get to them, Dr. Chin-Hong pointed out.

Another factor was “the public aspect of accessing diagnostics and vaccines and the way that that’s linked to potential judgment or sexual risk,” he added.

“Not everybody’s out,” Dr. Chin-Hong said, referring to members of the LGBTQ community. “In many communities of color, going to get a test or going to get a vaccine essentially means that you’re out.”

For clinicians who suspect monkeypox in a child, Dr. Harold suggests keeping a broad differential diagnosis, looking for an epidemiologic link, and contacting the CDC for assistance. Infected children should be encouraged to avoid touching their own eyes or mucous membranes, she added.

In addition, she said, tecovirimat is a reasonable treatment and is well tolerated by pediatric monkeypox patients with eczema, an underlying condition that could lead to severe disease.

For infected caregivers, Dr. Hennessee said, measures to prevent infecting children at home include isolation, contact precautions, and in some cases, postexposure prophylaxis via vaccination.

For sexually active adolescents, he advised that clinicians offer vaccination, education on sexual health, and testing for HIV and other sexually transmitted infections.

“It’s important to remember that adolescents may be sexually active, and clinicians should do a thorough and nonjudgmental sexual history,” Dr. Harold added. “That is always true, but especially if there is concern for [monkeypox].”

Dr. Hennessee, Dr. Chin-Hong, and Dr. Harold have disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Monkeypox virus infections in children and adolescents in the United States are rare, and young patients with known infections have all recovered, according to a study from the Centers for Disease Control and Prevention.

In addition, evidence suggests that secondary transmission in schools or childcare facilities may be unlikely.

The study was the first comprehensive study on the impact of monkeypox on children during the 2022 outbreak, according to a statement emailed to this news organization from the California Department of Public Health, one of the state health departments that partnered with the CDC to share information.

News of low infection rates and relatively mild disease was welcome to clinicians, who had braced for severe findings on the basis of sparse prior data, according to Peter Chin-Hong, MD, a professor of medicine and an infectious diseases physician at the University of California, San Francisco.

“We were on heightened alert that kids may do poorly,” said Dr. Chin-Hong, who was not involved in the study but who cared for monkeypox patients during the outbreak. “I think this study is reassuring.

“The other silver lining about it is that most of the kids got infected in the household setting from ways that you would expect them to get [infected],” Dr. Chin-Hong said in an interview.

However, Black and Hispanic children were more likely to contract the disease, underscoring troubling inequities.

“Early on, individuals of color were much less likely to be able to successfully access vaccination,” said first author Ian Hennessee, PhD, MPH, an epidemic intelligence service officer with the CDC and a member of the Special Case Investigation Unit of the Multinational Monkeypox Response Team at the CDC. “We think those kinds of structural inequities really trickled down towards the children and adolescents that have been affected by this outbreak.”

The study was published  in Morbidity and Mortality Weekly Report.
 

A nationwide look at the data

The researchers discussed 83 children and adolescents with monkeypox who came to the CDC’s attention between May 17 and Sept. 24, 2022.

The 83 cases represent 0.3% of the 25,038 reported monkeypox cases in the United States over that period. Of the 28 children aged 12 years or younger, 18 (64%) were boys. Sixteen children were younger than 4 years.

Exposure data were available for 20 (71%) of those aged 0-12. In that group, 19 were exposed at home; 17 cases were due to routine skin-to-skin contact with a household caregiver; and one case was suspected to be caused by fomites (such as a shared towel). Exposure information was unavailable for the remaining case.

Most of the children experienced lesions on the trunk. No lesions were anogenital. Two patients in the youngest age group were hospitalized because of widespread rash that involved the eyelids, and a patient in the 5- to 12-year-old group was hospitalized because of periorbital cellulitis and conjunctivitis.

Among those aged 13-17, there were 55 cases. Of these patients, 89% were boys. Exposure data were available for 35 (64%). In 32 of these patients, the infection occurred from presumed sexual contact. Twenty-three of those adolescents reported male-to-male sexual contact. No case was found to be connected with sexual abuse.

Lesions in the adolescents were mostly truncal or anogenital. Six in this group were hospitalized, and all of them recovered. One adolescent was found to be HIV positive.

Black and Hispanic children accounted for 47% and 35% of all cases, respectively.

Eleven percent of all the children and adolescents were hospitalized, and none received intensive care.

Treatments, when given, included the antiviral drug tecovirimat, intravenous vaccinia immune globulin, and topical trifluridine. There were no deaths.

Ten symptomatic patients attended school or daycare. Among these patients, no secondary transmissions were found to have occurred. Some contacts were offered the JYNNEOS monkeypox vaccine as postexposure prophylaxis.

Limitations of the study included potentially overlooked cases. Data were collected through routine surveillance, children frequently experience rashes, and access to testing has been a challenge, Dr. Hennessee explained.

In addition, data on exposure characteristics were missing for some children.
 

Inequities and the risks of being judged

The outbreak in the United States has eased in recent months. However, though uncommon in children, monkeypox has affected some racial groups disproportionately.

“Especially in the later course of the outbreak, the majority of cases were among Black and Hispanic individuals,” said co-author Rachel E. Harold, MD, an infectious diseases specialist and supervisory medical officer with the District of Columbia Department of Health’s HIV/AIDS, Hepatitis, STDs, and TB Administration.

“Unfortunately, the pediatric cases do reflect the outbreak overall,” she told this news organization.

Dr. Harold noted there have been efforts in D.C. and other jurisdictions, as well as by the White House monkeypox response team, to reach populations at greatest risk and that they were “really trying to make vaccine available to people of color.”

Vaccination clinics often popped up in unexpected locations at short notice, and that made it hard for some people to get to them, Dr. Chin-Hong pointed out.

Another factor was “the public aspect of accessing diagnostics and vaccines and the way that that’s linked to potential judgment or sexual risk,” he added.

“Not everybody’s out,” Dr. Chin-Hong said, referring to members of the LGBTQ community. “In many communities of color, going to get a test or going to get a vaccine essentially means that you’re out.”

For clinicians who suspect monkeypox in a child, Dr. Harold suggests keeping a broad differential diagnosis, looking for an epidemiologic link, and contacting the CDC for assistance. Infected children should be encouraged to avoid touching their own eyes or mucous membranes, she added.

In addition, she said, tecovirimat is a reasonable treatment and is well tolerated by pediatric monkeypox patients with eczema, an underlying condition that could lead to severe disease.

For infected caregivers, Dr. Hennessee said, measures to prevent infecting children at home include isolation, contact precautions, and in some cases, postexposure prophylaxis via vaccination.

For sexually active adolescents, he advised that clinicians offer vaccination, education on sexual health, and testing for HIV and other sexually transmitted infections.

“It’s important to remember that adolescents may be sexually active, and clinicians should do a thorough and nonjudgmental sexual history,” Dr. Harold added. “That is always true, but especially if there is concern for [monkeypox].”

Dr. Hennessee, Dr. Chin-Hong, and Dr. Harold have disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Monkeypox virus infections in children and adolescents in the United States are rare, and young patients with known infections have all recovered, according to a study from the Centers for Disease Control and Prevention.

In addition, evidence suggests that secondary transmission in schools or childcare facilities may be unlikely.

The study was the first comprehensive study on the impact of monkeypox on children during the 2022 outbreak, according to a statement emailed to this news organization from the California Department of Public Health, one of the state health departments that partnered with the CDC to share information.

News of low infection rates and relatively mild disease was welcome to clinicians, who had braced for severe findings on the basis of sparse prior data, according to Peter Chin-Hong, MD, a professor of medicine and an infectious diseases physician at the University of California, San Francisco.

“We were on heightened alert that kids may do poorly,” said Dr. Chin-Hong, who was not involved in the study but who cared for monkeypox patients during the outbreak. “I think this study is reassuring.

“The other silver lining about it is that most of the kids got infected in the household setting from ways that you would expect them to get [infected],” Dr. Chin-Hong said in an interview.

However, Black and Hispanic children were more likely to contract the disease, underscoring troubling inequities.

“Early on, individuals of color were much less likely to be able to successfully access vaccination,” said first author Ian Hennessee, PhD, MPH, an epidemic intelligence service officer with the CDC and a member of the Special Case Investigation Unit of the Multinational Monkeypox Response Team at the CDC. “We think those kinds of structural inequities really trickled down towards the children and adolescents that have been affected by this outbreak.”

The study was published  in Morbidity and Mortality Weekly Report.
 

A nationwide look at the data

The researchers discussed 83 children and adolescents with monkeypox who came to the CDC’s attention between May 17 and Sept. 24, 2022.

The 83 cases represent 0.3% of the 25,038 reported monkeypox cases in the United States over that period. Of the 28 children aged 12 years or younger, 18 (64%) were boys. Sixteen children were younger than 4 years.

Exposure data were available for 20 (71%) of those aged 0-12. In that group, 19 were exposed at home; 17 cases were due to routine skin-to-skin contact with a household caregiver; and one case was suspected to be caused by fomites (such as a shared towel). Exposure information was unavailable for the remaining case.

Most of the children experienced lesions on the trunk. No lesions were anogenital. Two patients in the youngest age group were hospitalized because of widespread rash that involved the eyelids, and a patient in the 5- to 12-year-old group was hospitalized because of periorbital cellulitis and conjunctivitis.

Among those aged 13-17, there were 55 cases. Of these patients, 89% were boys. Exposure data were available for 35 (64%). In 32 of these patients, the infection occurred from presumed sexual contact. Twenty-three of those adolescents reported male-to-male sexual contact. No case was found to be connected with sexual abuse.

Lesions in the adolescents were mostly truncal or anogenital. Six in this group were hospitalized, and all of them recovered. One adolescent was found to be HIV positive.

Black and Hispanic children accounted for 47% and 35% of all cases, respectively.

Eleven percent of all the children and adolescents were hospitalized, and none received intensive care.

Treatments, when given, included the antiviral drug tecovirimat, intravenous vaccinia immune globulin, and topical trifluridine. There were no deaths.

Ten symptomatic patients attended school or daycare. Among these patients, no secondary transmissions were found to have occurred. Some contacts were offered the JYNNEOS monkeypox vaccine as postexposure prophylaxis.

Limitations of the study included potentially overlooked cases. Data were collected through routine surveillance, children frequently experience rashes, and access to testing has been a challenge, Dr. Hennessee explained.

In addition, data on exposure characteristics were missing for some children.
 

Inequities and the risks of being judged

The outbreak in the United States has eased in recent months. However, though uncommon in children, monkeypox has affected some racial groups disproportionately.

“Especially in the later course of the outbreak, the majority of cases were among Black and Hispanic individuals,” said co-author Rachel E. Harold, MD, an infectious diseases specialist and supervisory medical officer with the District of Columbia Department of Health’s HIV/AIDS, Hepatitis, STDs, and TB Administration.

“Unfortunately, the pediatric cases do reflect the outbreak overall,” she told this news organization.

Dr. Harold noted there have been efforts in D.C. and other jurisdictions, as well as by the White House monkeypox response team, to reach populations at greatest risk and that they were “really trying to make vaccine available to people of color.”

Vaccination clinics often popped up in unexpected locations at short notice, and that made it hard for some people to get to them, Dr. Chin-Hong pointed out.

Another factor was “the public aspect of accessing diagnostics and vaccines and the way that that’s linked to potential judgment or sexual risk,” he added.

“Not everybody’s out,” Dr. Chin-Hong said, referring to members of the LGBTQ community. “In many communities of color, going to get a test or going to get a vaccine essentially means that you’re out.”

For clinicians who suspect monkeypox in a child, Dr. Harold suggests keeping a broad differential diagnosis, looking for an epidemiologic link, and contacting the CDC for assistance. Infected children should be encouraged to avoid touching their own eyes or mucous membranes, she added.

In addition, she said, tecovirimat is a reasonable treatment and is well tolerated by pediatric monkeypox patients with eczema, an underlying condition that could lead to severe disease.

For infected caregivers, Dr. Hennessee said, measures to prevent infecting children at home include isolation, contact precautions, and in some cases, postexposure prophylaxis via vaccination.

For sexually active adolescents, he advised that clinicians offer vaccination, education on sexual health, and testing for HIV and other sexually transmitted infections.

“It’s important to remember that adolescents may be sexually active, and clinicians should do a thorough and nonjudgmental sexual history,” Dr. Harold added. “That is always true, but especially if there is concern for [monkeypox].”

Dr. Hennessee, Dr. Chin-Hong, and Dr. Harold have disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Monkeypox, though often mild, may be severe and even fatal in immunocompromised individuals, particularly those with untreated AIDS, according to a Centers for Disease Control and Prevention study in Morbidity and Mortality Weekly Report.

The study described a group of patients recently treated for severe monkeypox. The majority were Black, HIV positive, and not receiving treatment. Many were also facing homelessness.

The authors urged HIV testing for all sexually active individuals with suspected monkeypox. Early or prolonged monkeypox treatment may be necessary, they concluded.

Coauthor John T. Brooks, MD, called the study “a real call to action.”

“If we want to reduce cases of severe monkeypox, we need to reduce the number of persons with HIV who are undiagnosed and not treated,” said Dr. Brooks, a medical epidemiologist who is chief medical officer of CDC›s multinational monkeypox response. Dr. Brooks also leads the epidemiology research team in CDC’s division of HIV/AIDS prevention.

The article reflects long-existing health disparities, noted Richard Silvera, MD, MPH, CPH, who is associate program director of the infectious diseases fellowship and assistant professor of medicine (infectious diseases) at the Icahn School of Medicine at Mount Sinai, New York. He was not involved with the study.

“These patients really have not been served by the health care system,” Dr. Silvera said. “Monkeypox is just really taking advantage of that.”
 

How severe monkeypox can manifest

The authors reported on 57 adults hospitalized with severe monkeypox between Aug. 10 and Sept. 10, 2022, for whose care the providers sought CDC consultation.

The vast majority (95%) were men, their median age was 34 years, and 68% were Black. Nearly one in four were homeless (23%).

Overall, 47 (82%) were HIV positive, of whom just 4 had been receiving antiretroviral therapy (ART). Of 43 for whom CD4 counts were known, 71% had fewer than 50 CD4 cells/mm3.

Clinical signs included severe skin lesions in all patients and severe mucosal lesions in 68%. Other affected organ systems included lungs (21%), eyes (21%), and central nervous system (7%).

Treatments included oral or intravenous tecovirimat (93% and 65%, respectively), vaccinia immune globulin intravenous (VIGIV, 51%), and cidofovir (23%).

Nearly 1 in 3 patients (30%) received care in an ICU; 12 died (21%). Monkeypox was considered the cause or a contributing factor in five of the deaths and not a factor in one death; the remaining six deaths are under investigation.
 

Case studies

The report included details of three representative cases of the CDC consultations.

One was a Hispanic man in his 20s with a fever of 102.8° F, a rash including eschars, oral lesions, neck mass, and cervical lymphadenopathy. He had tested positive for monkeypox as an outpatient and upon admission was found to be HIV positive, with a CD4 count of 79 cells/mm³. He experienced a severe and ultimately fatal clinical course that included intubation, refractory hypotension, seizures, renal failure, and cardiac arrest. An autopsy revealed diffuse organ necrosis plus orthopoxvirus and cytomegalovirus.

The second was a Black man in his 30s with untreated AIDS and diffuse rash. He was tested and treated for gonorrhea, chlamydia, and syphilis before phimosis and urinary retention led to admission and a monkeypox diagnosis 4 weeks after his rash began. He was discharged with oral tecovirimat, but his skin lesions developed necrosis and he was readmitted twice, each time with new lesions. His clinical course included methicillin-resistant Staphylococcus aureus bacteremia, atrial fibrillation, eye and ear involvement, a suprapubic catheter, and progressive necrosis of his lesions. As of the CDC report, he was receiving ART and intravenous tecovirimat.

The third patient, a White man in his 40s with untreated AIDS, presented with diffuse rash. He was promptly diagnosed with monkeypox and admitted for pain control. He was discharged with oral tecovirimat and ART, but homelessness and food insecurity jeopardized the absorption of his tecovirimat (which depends on a full fatty meal), and the lesions worsened. Despite readmission and aggressive medical treatment, the patient required finger debridement and a toe amputation. After discharge, he was again readmitted for lesions and pain and, at report publication, remained hospitalized, taking oral tecovirimat and ART.

The patients in the study may not be typical of severe monkeypox cases, wrote the authors reported. Deaths after the study period were not counted.
 

Fewer cases, some severe

As of Nov. 7, the CDC has confirmed 28,709 monkeypox cases. These have trended downward since August. Most people with recent diagnoses are men who are gay, bisexual, same gender loving, or who have sex with men, and most are Black, according to Brooks.

Dr. Brooks urges clinicians to report suspected monkeypox cases – especially severe ones – to their health departments.

“We don’t have a good bead on exactly how many severe cases there are in the States because of complexities in our surveillance systems,” Dr. Brooks said.

For patients with suspected or confirmed monkeypox, Brooks recommends testing for sexually transmitted infections, including HIV if status is unknown. Patients with HIV should receive prompt ART. For those at risk for severe disease, the authors recommend early treatment for suspected monkeypox, even before results are back. Some patients may benefit from tecovirimat courses lasting beyond 14 days, plus additional antivirals (cidofovir or brincidofovir) and/or VIGIV.

“With severe cases, clinicians may want to consider the value of more than one drug to attack the virus at different stages of its replication cycle,” Dr. Brooks said.
 

Inequities matter

The authors called on providers to engage communities burdened by HIV and to ensure access to not only monkeypox vaccination, diagnosis, and treatment but also sustained HIV care.

Dr. Silvera added that providers need to tailor care plans to patients’ social determinants of health. For example, he explained, inpatient care for monkeypox could be appropriate for some patients facing homelessness and food insecurity – even if they are able to take tecovirimat orally.

He recommends tapping others’ expertise: “Our social work colleagues are well versed in this.”

“I don’t think these clinicians failed these patients. ... I think everyone made all the right choices medically,” Dr. Silvera added. “I think that the system failed these patients – and we as clinicians are part of those systems. So we also have the power to change those systems. And I think we just need to start opening our eyes to that and [start] to work together towards that goal to take better care of our patients.”

Dr. Brooks reported no relevant financial disclosures.

A version of this article first appeared on Medscape.com.

Monkeypox, though often mild, may be severe and even fatal in immunocompromised individuals, particularly those with untreated AIDS, according to a Centers for Disease Control and Prevention study in Morbidity and Mortality Weekly Report.

The study described a group of patients recently treated for severe monkeypox. The majority were Black, HIV positive, and not receiving treatment. Many were also facing homelessness.

The authors urged HIV testing for all sexually active individuals with suspected monkeypox. Early or prolonged monkeypox treatment may be necessary, they concluded.

Coauthor John T. Brooks, MD, called the study “a real call to action.”

“If we want to reduce cases of severe monkeypox, we need to reduce the number of persons with HIV who are undiagnosed and not treated,” said Dr. Brooks, a medical epidemiologist who is chief medical officer of CDC›s multinational monkeypox response. Dr. Brooks also leads the epidemiology research team in CDC’s division of HIV/AIDS prevention.

The article reflects long-existing health disparities, noted Richard Silvera, MD, MPH, CPH, who is associate program director of the infectious diseases fellowship and assistant professor of medicine (infectious diseases) at the Icahn School of Medicine at Mount Sinai, New York. He was not involved with the study.

“These patients really have not been served by the health care system,” Dr. Silvera said. “Monkeypox is just really taking advantage of that.”
 

How severe monkeypox can manifest

The authors reported on 57 adults hospitalized with severe monkeypox between Aug. 10 and Sept. 10, 2022, for whose care the providers sought CDC consultation.

The vast majority (95%) were men, their median age was 34 years, and 68% were Black. Nearly one in four were homeless (23%).

Overall, 47 (82%) were HIV positive, of whom just 4 had been receiving antiretroviral therapy (ART). Of 43 for whom CD4 counts were known, 71% had fewer than 50 CD4 cells/mm3.

Clinical signs included severe skin lesions in all patients and severe mucosal lesions in 68%. Other affected organ systems included lungs (21%), eyes (21%), and central nervous system (7%).

Treatments included oral or intravenous tecovirimat (93% and 65%, respectively), vaccinia immune globulin intravenous (VIGIV, 51%), and cidofovir (23%).

Nearly 1 in 3 patients (30%) received care in an ICU; 12 died (21%). Monkeypox was considered the cause or a contributing factor in five of the deaths and not a factor in one death; the remaining six deaths are under investigation.
 

Case studies

The report included details of three representative cases of the CDC consultations.

One was a Hispanic man in his 20s with a fever of 102.8° F, a rash including eschars, oral lesions, neck mass, and cervical lymphadenopathy. He had tested positive for monkeypox as an outpatient and upon admission was found to be HIV positive, with a CD4 count of 79 cells/mm³. He experienced a severe and ultimately fatal clinical course that included intubation, refractory hypotension, seizures, renal failure, and cardiac arrest. An autopsy revealed diffuse organ necrosis plus orthopoxvirus and cytomegalovirus.

The second was a Black man in his 30s with untreated AIDS and diffuse rash. He was tested and treated for gonorrhea, chlamydia, and syphilis before phimosis and urinary retention led to admission and a monkeypox diagnosis 4 weeks after his rash began. He was discharged with oral tecovirimat, but his skin lesions developed necrosis and he was readmitted twice, each time with new lesions. His clinical course included methicillin-resistant Staphylococcus aureus bacteremia, atrial fibrillation, eye and ear involvement, a suprapubic catheter, and progressive necrosis of his lesions. As of the CDC report, he was receiving ART and intravenous tecovirimat.

The third patient, a White man in his 40s with untreated AIDS, presented with diffuse rash. He was promptly diagnosed with monkeypox and admitted for pain control. He was discharged with oral tecovirimat and ART, but homelessness and food insecurity jeopardized the absorption of his tecovirimat (which depends on a full fatty meal), and the lesions worsened. Despite readmission and aggressive medical treatment, the patient required finger debridement and a toe amputation. After discharge, he was again readmitted for lesions and pain and, at report publication, remained hospitalized, taking oral tecovirimat and ART.

The patients in the study may not be typical of severe monkeypox cases, wrote the authors reported. Deaths after the study period were not counted.
 

Fewer cases, some severe

As of Nov. 7, the CDC has confirmed 28,709 monkeypox cases. These have trended downward since August. Most people with recent diagnoses are men who are gay, bisexual, same gender loving, or who have sex with men, and most are Black, according to Brooks.

Dr. Brooks urges clinicians to report suspected monkeypox cases – especially severe ones – to their health departments.

“We don’t have a good bead on exactly how many severe cases there are in the States because of complexities in our surveillance systems,” Dr. Brooks said.

For patients with suspected or confirmed monkeypox, Brooks recommends testing for sexually transmitted infections, including HIV if status is unknown. Patients with HIV should receive prompt ART. For those at risk for severe disease, the authors recommend early treatment for suspected monkeypox, even before results are back. Some patients may benefit from tecovirimat courses lasting beyond 14 days, plus additional antivirals (cidofovir or brincidofovir) and/or VIGIV.

“With severe cases, clinicians may want to consider the value of more than one drug to attack the virus at different stages of its replication cycle,” Dr. Brooks said.
 

Inequities matter

The authors called on providers to engage communities burdened by HIV and to ensure access to not only monkeypox vaccination, diagnosis, and treatment but also sustained HIV care.

Dr. Silvera added that providers need to tailor care plans to patients’ social determinants of health. For example, he explained, inpatient care for monkeypox could be appropriate for some patients facing homelessness and food insecurity – even if they are able to take tecovirimat orally.

He recommends tapping others’ expertise: “Our social work colleagues are well versed in this.”

“I don’t think these clinicians failed these patients. ... I think everyone made all the right choices medically,” Dr. Silvera added. “I think that the system failed these patients – and we as clinicians are part of those systems. So we also have the power to change those systems. And I think we just need to start opening our eyes to that and [start] to work together towards that goal to take better care of our patients.”

Dr. Brooks reported no relevant financial disclosures.

A version of this article first appeared on Medscape.com.

Monkeypox, though often mild, may be severe and even fatal in immunocompromised individuals, particularly those with untreated AIDS, according to a Centers for Disease Control and Prevention study in Morbidity and Mortality Weekly Report.

The study described a group of patients recently treated for severe monkeypox. The majority were Black, HIV positive, and not receiving treatment. Many were also facing homelessness.

The authors urged HIV testing for all sexually active individuals with suspected monkeypox. Early or prolonged monkeypox treatment may be necessary, they concluded.

Coauthor John T. Brooks, MD, called the study “a real call to action.”

“If we want to reduce cases of severe monkeypox, we need to reduce the number of persons with HIV who are undiagnosed and not treated,” said Dr. Brooks, a medical epidemiologist who is chief medical officer of CDC›s multinational monkeypox response. Dr. Brooks also leads the epidemiology research team in CDC’s division of HIV/AIDS prevention.

The article reflects long-existing health disparities, noted Richard Silvera, MD, MPH, CPH, who is associate program director of the infectious diseases fellowship and assistant professor of medicine (infectious diseases) at the Icahn School of Medicine at Mount Sinai, New York. He was not involved with the study.

“These patients really have not been served by the health care system,” Dr. Silvera said. “Monkeypox is just really taking advantage of that.”
 

How severe monkeypox can manifest

The authors reported on 57 adults hospitalized with severe monkeypox between Aug. 10 and Sept. 10, 2022, for whose care the providers sought CDC consultation.

The vast majority (95%) were men, their median age was 34 years, and 68% were Black. Nearly one in four were homeless (23%).

Overall, 47 (82%) were HIV positive, of whom just 4 had been receiving antiretroviral therapy (ART). Of 43 for whom CD4 counts were known, 71% had fewer than 50 CD4 cells/mm3.

Clinical signs included severe skin lesions in all patients and severe mucosal lesions in 68%. Other affected organ systems included lungs (21%), eyes (21%), and central nervous system (7%).

Treatments included oral or intravenous tecovirimat (93% and 65%, respectively), vaccinia immune globulin intravenous (VIGIV, 51%), and cidofovir (23%).

Nearly 1 in 3 patients (30%) received care in an ICU; 12 died (21%). Monkeypox was considered the cause or a contributing factor in five of the deaths and not a factor in one death; the remaining six deaths are under investigation.
 

Case studies

The report included details of three representative cases of the CDC consultations.

One was a Hispanic man in his 20s with a fever of 102.8° F, a rash including eschars, oral lesions, neck mass, and cervical lymphadenopathy. He had tested positive for monkeypox as an outpatient and upon admission was found to be HIV positive, with a CD4 count of 79 cells/mm³. He experienced a severe and ultimately fatal clinical course that included intubation, refractory hypotension, seizures, renal failure, and cardiac arrest. An autopsy revealed diffuse organ necrosis plus orthopoxvirus and cytomegalovirus.

The second was a Black man in his 30s with untreated AIDS and diffuse rash. He was tested and treated for gonorrhea, chlamydia, and syphilis before phimosis and urinary retention led to admission and a monkeypox diagnosis 4 weeks after his rash began. He was discharged with oral tecovirimat, but his skin lesions developed necrosis and he was readmitted twice, each time with new lesions. His clinical course included methicillin-resistant Staphylococcus aureus bacteremia, atrial fibrillation, eye and ear involvement, a suprapubic catheter, and progressive necrosis of his lesions. As of the CDC report, he was receiving ART and intravenous tecovirimat.

The third patient, a White man in his 40s with untreated AIDS, presented with diffuse rash. He was promptly diagnosed with monkeypox and admitted for pain control. He was discharged with oral tecovirimat and ART, but homelessness and food insecurity jeopardized the absorption of his tecovirimat (which depends on a full fatty meal), and the lesions worsened. Despite readmission and aggressive medical treatment, the patient required finger debridement and a toe amputation. After discharge, he was again readmitted for lesions and pain and, at report publication, remained hospitalized, taking oral tecovirimat and ART.

The patients in the study may not be typical of severe monkeypox cases, wrote the authors reported. Deaths after the study period were not counted.
 

Fewer cases, some severe

As of Nov. 7, the CDC has confirmed 28,709 monkeypox cases. These have trended downward since August. Most people with recent diagnoses are men who are gay, bisexual, same gender loving, or who have sex with men, and most are Black, according to Brooks.

Dr. Brooks urges clinicians to report suspected monkeypox cases – especially severe ones – to their health departments.

“We don’t have a good bead on exactly how many severe cases there are in the States because of complexities in our surveillance systems,” Dr. Brooks said.

For patients with suspected or confirmed monkeypox, Brooks recommends testing for sexually transmitted infections, including HIV if status is unknown. Patients with HIV should receive prompt ART. For those at risk for severe disease, the authors recommend early treatment for suspected monkeypox, even before results are back. Some patients may benefit from tecovirimat courses lasting beyond 14 days, plus additional antivirals (cidofovir or brincidofovir) and/or VIGIV.

“With severe cases, clinicians may want to consider the value of more than one drug to attack the virus at different stages of its replication cycle,” Dr. Brooks said.
 

Inequities matter

The authors called on providers to engage communities burdened by HIV and to ensure access to not only monkeypox vaccination, diagnosis, and treatment but also sustained HIV care.

Dr. Silvera added that providers need to tailor care plans to patients’ social determinants of health. For example, he explained, inpatient care for monkeypox could be appropriate for some patients facing homelessness and food insecurity – even if they are able to take tecovirimat orally.

He recommends tapping others’ expertise: “Our social work colleagues are well versed in this.”

“I don’t think these clinicians failed these patients. ... I think everyone made all the right choices medically,” Dr. Silvera added. “I think that the system failed these patients – and we as clinicians are part of those systems. So we also have the power to change those systems. And I think we just need to start opening our eyes to that and [start] to work together towards that goal to take better care of our patients.”

Dr. Brooks reported no relevant financial disclosures.

A version of this article first appeared on Medscape.com.