The first known human infection with the H5N5 strain of bird flu has resulted in a fatal case in the United States, marking a sobering milestone in the global story of avian influenza. Health ...

H5N1 bird flu has infected growing numbers of people worldwide in recent years, but this week saw something new: the first ...

Arizona is reporting its first two probable human cases of bird flu in Pinal County workers who were exposed to infected ...

California could see an early and especially sharp start to the annual flu season, as a combination of low vaccination rates ...