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

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 ...

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

Health officials say they don’t know how a Missouri person caught bird flu, but they believe it may be a rare instance of a ...

Federal officials are still trying to determine how a Missouri resident with no known exposure to bird flu, contracted the ...

Missouri reported its first human case of the current U.S. outbreak. All other 14 cases nationwide have been livestock ...

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

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

So far, there have been 14 human cases of bird flu this year. All the patients — except the one from Missouri — had been linked to sick dairy cows or poultry.

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

A person in Missouri is the United States' first case of H5 avian influenza without a known exposure to a sick animal.

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