Britain has confirmed nine cases since May 6, and the United States verified its first on Wednesday, saying a man in the eastern state of Massachusetts had tested positive for the virus after visiting Canada.
The illness, from which most people recover within several weeks and has only been fatal in rare cases, has infected thousands of people in parts of Central and Western Africa in recent years but is rare in Europe and North Africa.
The World Health Organization (WHO) said on Tuesday it was coordinating with UK and European health officials over the new outbreaks.
“We really need to better understand the extent of monkeypox in endemic countries… to really understand how much is circulating and the risk that it poses for people who are living there, as well as the risk of exportation,” infectious disease epidemiologist Dr. Maria Van Kerkhove said at a WHO press conference on Tuesday on global health issues.
The first case in Britain was someone who had traveled from Nigeria, though later cases were possibly through community transmission, the UK Health Security Agency (UKHSA) said in a statement.
“These latest cases, together with reports of cases in countries across Europe, confirms our initial concerns that there could be spread of monkeypox within our communities,” said UKHSA Chief Medical Adviser Dr. Susan Hopkins.
The WHO said it was also investigating that many cases reported were people identifying as gay, bisexual or men who have sex with men.
“We are seeing transmission among men having sex with men,” said WHO Assistant Director-General Dr. Soce Fall at the press conference.
“This is new information we need to investigate properly to understand better the dynamic of local transmission in the UK and some other countries.”
‘No risk to the public’
The UKHSA noted that monkeypox has not previously been characterized as a sexually transmitted disease, underscoring that “it can be passed on by direct contact during sex.”
“Anyone, regardless of sexual orientation, can spread monkeypox through contact with body fluids, monkeypox sores, or shared items (such as clothing and bedding) that have been contaminated with fluids or sores of a person with monkeypox,” a US Centers for Disease Control and Prevention (CDC) statement said Wednesday, adding that household disinfectants can kill the virus on surfaces.
The illness often starts with flu-like symptoms such as fever, muscle ache and swollen lymph nodes before causing a chickenpox-like rash on the face and body, the US agency explained.
The Massachusetts Department of Health, said that the case there — the first confirmed this year in the United States — occurred in a patient who had recently traveled to Canada and “poses no risk to the public, and the individual is hospitalized and in good condition.”
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