Helen Branswell

The threat of the virus has clearly subsided, but opinions vary on how much and who remains at risk

A new policy that recommends offering hepatitis B vaccine at birth only to babies perceived to be at risk will lead to increased numbers of infected infants and more cases of chronic infection, new studies found.

‘Questioning the vaccine schedule, that doesn't mean you're anti-vax'

It's not the start of a pandemic, they say, but we need to learn more about these viruses

The U.S. and Argentina, both recent WHO dropouts, are cooperating in the response

Cases are reminiscent of emergence of mpox but condition appears mild

At least one may have developed symptoms, sources say, but test results not yet available

Animal study suggests Merck's Ervebo, designed for another strain of the virus, may offer some protection

Exit of Jeffery Taubenberger, director of NIAID, would widen leadership vacuum at nation's top biomedical research agency

Bid to keep virus out may create risks for infected Americans and discourage volunteers