In advance of a scientific meeting on Thursday, officials proposed offering new shots to Americans each fall, a strategy long employed against the flu.

Janssen Pharmaceuticals ended a global trial after independent experts determined the vaccine was not effective. But there are other possibilities in the pipeline, scientists said.

An uptick hinted at in surveillance data was a mirage, the officials said.

The shots may help older, pregnant and immunocompromised Americans dodge serious illness or death. But the doses are not likely to prevent infections in any...

Vaccines and treatments are in trials, but the virus remains a leading killer of infants worldwide.

The nation is often the second-largest donor to groups working in poor countries to prevent and treat infectious diseases, and to provide reproductive health services...