The mystery continues over how a Missouri man came down with the bird flu -- without having any animal contact.  Experts say ...

Federal officials plan to double the stockpile of emergency bird flu vaccines as they identify more people infected with the ...

A person in Missouri was also infected, but that person had no known contact with animals and the source of that illness has ...

The spread of the H5N1 bird flu virus across 14 states in the US has baffled health experts, who are waiting for a few tests ...