A close contact of someone with bird flu became ill on the same day, the C.D.C. reported. But the second person was not ...

In a disclosure that can't eliminate the possibility that bird flu may have spread from one human to another for the first ...

A patient in Missouri who was hospitalized after an infection with bird flu had the H5N1 strain of the virus, the US Centers ...

A person sickened by bird flu in Missouri was probably an isolated case, federal health officials said Thursday, though they ...

Health officials on Thursday said they don’t know how a Missouri person caught bird flu but believe it may be a rare instance ...

In a case that continues to confound scientists, U.S. health officials said Thursday that they still don't know how ...

Epidemiologists have not yet identified exactly how a person in Missouri contracted bird flu last week, said the U.S. Centers ...

WASHINGTON — Public health officials are still trying to determine how a Missouri resident contracted bird flu without having ...

The Centers for Disease Control and Prevention said Thursday it has yet to identify “a clear source” of infection in a ...