The European Union's infectious disease agency

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McQuiston added later that the Biden administration had over 100 million doses available of ACAM2000, but acknowledged that — given that shot's downsides — "a decision to use that widely would have to have some serious discussion behind it."

A spokesperson for the Department of Health and Human Services — which manages the Strategic National Stockpile — acknowledged "multiple requests" for Jynneos from around the country, but did not offer a specific figure on the country's expected supply.

"We stand ready to review and support additional jurisdictions requests, as needed," the spokesperson said.

Not all cases identified in the U.S. have been linked to recent international travel to countries now facing active monkeypox outbreaks, CDC Director Dr. Rochelle Walensky told reporters on Thursday.

"I think that we need to presume that there are some community buy phone number list spread, but there is active contact tracing that is happening right now to understand how these cases might have been in contact with each other or with others in other countries," said Walensky.

However, officials said that the discovery of potential community spread in the U.S. was not a cause — for now — to shift the country's monkeypox vaccination strategy.

"Right now, while we are in the early phase of investigating this, we know that those at highest risk of infection are those who had contact with a known monkeypox patient with the kind of contact that would facilitate spread," McQuiston said on Thursday.

"We continue to watch what is happening, and think about whether wider vaccination recommendations would make sense," McQuiston added.

London — has recommended that EU member states review the availability of smallpox vaccines in their countries for possible prophylactic use in the face of rising monkeypox cases.