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Virus World provides a daily blog of the latest news in the Virology field and the COVID-19 pandemic. News on new antiviral drugs, vaccines, diagnostic tests, viral outbreaks, novel viruses and milestone discoveries are curated by expert virologists. Highlighted news include trending and most cited scientific articles in these fields with links to the original publications. Stay up-to-date with the most exciting discoveries in the virus world and the last therapies for COVID-19 without spending hours browsing news and scientific publications. Additional comments by experts on the topics are available in Linkedin (https://www.linkedin.com/in/juanlama/detail/recent-activity/)
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Monkeypox in a Young Infant — Florida, 2022 | MMWR

Monkeypox in a Young Infant — Florida, 2022 | MMWR | Virus World | Scoop.it

This report describes the investigation into the first young infant with confirmed monkeypox in Florida. In August 2022, the Florida  Department of Health (FDOH) was notified of a suspected case of monkeypox in an infant aged <2 months who was admitted to a Florida hospital with a rash and cellulitis. This case report highlights findings from the related epidemiologic investigation and describes the public health actions taken. This activity was reviewed by CDC and was conducted consistent with applicable federal law and CDC policy.* This is the youngest patient with confirmed monkeypox infection in Florida to date. The infant was initially evaluated in an emergency department (ED) for a raised erythematous rash on the arms, legs, and trunk which had been present for 5 days. A rash swab was collected for bacterial culture and yielded a negative test result. Varicella, herpes simplex virus, and HIV testing were also negative. The patient returned to the ED 2 days later, at which time the rash had progressed to include numerous, diffusely scattered papulovesicular lesions over the body, many with central umbilication. The infant was admitted to the hospital with a diagnosis of molluscum contagiosum and started on intravenous antibiotics for secondary bacterial cellulitis associated with having scratched a lesion on the arm. The lesions subsequently spread to the back, soles of feet, face, and eyelid and became pustular over the first few days of admission. Swabs from forehead and back lesions tested positive for Orthopoxvirus DNA and Clade II Monkeypox virus DNA by polymerase chain reaction 10 days after rash onset (Figure). Results were confirmed by the Florida public health laboratory and CDC.† FDOH and hospital clinicians consulted with CDC regarding treatment options.

 

The infant was treated with oral tecovirimat and Vaccinia Immune Globulin Intravenous (1). Prophylactic trifluridine§ drops were administered to prevent ophthalmic complications from the eyelid lesion. The infant remained afebrile and stable throughout the course of illness, tolerated the treatments well, and fully recovered. The infant had no history of travel, no history of acute infections in the 3 weeks preceding rash onset, no known immunocompromising conditions, did not attend a child care facility, and had no caregivers outside the home. Within the home, the infant was cared for by four caregivers. Caregiver A acted as the main guardian throughout the infant’s hospital stay and had prolonged exposure with skin-to-skin contact. Caregiver B reported activities that placed him at high risk for monkeypox exposure during the 2 months preceding the infant’s illness (2). Caregiver B reported hematuria and fever, followed by a rash within the 3 weeks before the infant’s symptom onset. One day before the infant became symptomatic, caregiver B moved to another state and sought medical care for his symptoms. He received a positive Orthopoxvirus DNA test result 2 days after the infant’s positive test result, after which, he was lost to follow-up. The infant had daily close contact with caregiver B in the home for 6 weeks before rash onset. Possible routes of transmission included shared bed linens and skin-to-skin contact through holding and daily care activities.

 

Investigation identified three other household family members with household exposures to both the infant and caregiver B. Caregiver B, caregiver C, and the infant shared a bed for the 6 weeks preceding the infant’s symptom onset. All household members (caregivers A, B, C, and D) held the infant with close skin-to-skin contact. Caregivers A, C, and D received postexposure prophylaxis with JYNNEOS vaccine and remained asymptomatic at 22 days after the infant’s symptom onset (2,3). Caregiver A had also received smallpox vaccination during childhood.  To date, 27 confirmed cases of monkeypox in pediatric patients aged 0–15 years have been reported in the United States during the 2022 outbreak (4). Clinical presentations in children with monkeypox have been similar to those in adults, although children might have a higher risk for severe disease (5). Timely laboratory identification and thorough epidemiologic investigation are critical for effective public health response to monkeypox infection. In this case, contact tracing and postexposure prophylaxis vaccination of close contacts of the affected infant might have prevented further transmission to household members (3). Clinicians should consider monkeypox infection as a differential diagnosis in pediatric patients with pustular or vesicular rashes and be aware of the possibility for household transmission to pediatric patients, particularly if the children meet epidemiologic exposure criteria for diagnosis of monkeypox (6).

 

Published in MMWR (Sept.19, 2022):

http://dx.doi.org/10.15585/mmwr.mm7138e3 

 
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Public Health Response to a Case of Paralytic Poliomyelitis in an Unvaccinated Person and Detection of Poliovirus in Wastewater — New York, June–August 2022 | MMWR

Public Health Response to a Case of Paralytic Poliomyelitis in an Unvaccinated Person and Detection of Poliovirus in Wastewater — New York, June–August 2022 | MMWR | Virus World | Scoop.it

This report describes a case of polio in an unvaccinated adult resident of New York and highlights why it’s important to stay up to date on recommended poliovirus vaccination. 

 

On July 18, 2022, the New York State Department of Health (NYSDOH) notified CDC of detection of poliovirus type 2 in stool specimens from an unvaccinated immunocompetent young adult from Rockland County, New York, who was experiencing acute flaccid weakness. The patient initially experienced fever, neck stiffness, gastrointestinal symptoms, and limb weakness. The patient was hospitalized with possible acute flaccid myelitis (AFM). Vaccine-derived poliovirus type 2 (VDPV2) was detected in stool specimens obtained on days 11 and 12 after initial symptom onset. To date, related Sabin-like type 2 polioviruses have been detected in wastewater* in the patient’s county of residence and in neighboring Orange County up to 25 days before (from samples originally collected for SARS-CoV-2 wastewater monitoring) and 41 days after the patient’s symptom onset. The last U.S. case of polio caused by wild poliovirus occurred in 1979, and the World Health Organization Region of the Americas was declared polio-free in 1994. This report describes the second identification of community transmission of poliovirus in the United States since 1979; the previous instance, in 2005, was a type 1 VDPV (1). The occurrence of this case, combined with the identification of poliovirus in wastewater in neighboring Orange County, underscores the importance of maintaining high vaccination coverage to prevent paralytic polio in persons of all ages.

Case Findings

In June 2022, a young adult with a 5-day history of low-grade fever, neck stiffness, back and abdominal pain, constipation, and 2 days of bilateral lower extremity weakness visited an emergency department and was subsequently hospitalized with suspected AFM; the patient was unvaccinated against polio (Figure). As part of national AFM surveillance,† the suspected case was reported to NYSDOH and then to CDC. The patient was discharged to a rehabilitation facility 16 days after symptom onset with ongoing lower extremity flaccid weakness. A combined nasopharyngeal/oropharyngeal swab and cerebrospinal fluid sample were negative by reverse transcription–polymerase chain reaction (RT-PCR) testing for enteroviruses and human parechovirus, as well as for a panel of common respiratory pathogens and encephalitic viruses by molecular methods (2). RT-PCR and sequencing of a stool specimen by the NYSDOH laboratory identified poliovirus type 2. Specimens were tested at CDC using RT-PCR (3) and sequencing, confirming the presence of poliovirus type 2 in both stool specimens. Additional sequencing identified the virus as VDPV2 (4), differing from the Sabin 2 vaccine strain by 10 nucleotide changes in the region encoding the viral capsid protein, VP1, suggesting transmission for up to 1 year although the location of that transmission is unknown. Based on the typical incubation period for paralytic polio, the presumed period of exposure occurred 7 to 21 days before the onset of paralysis. Epidemiologic investigation revealed that the patient attended a large gathering 8 days before symptom onset and had not traveled internationally during the presumed exposure period. No other notable or known potential exposures were identified.

 

Published in Morbidity and Mortality Weekly Report (August 16, 2022):

http://dx.doi.org/10.15585/mmwr.mm7133e2 

 
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