A three-year-old girl has died of multiple organ failure in northern Mexico, the local health secretary announced on Tuesday.

But that's missing the bigger picture, experts told MedPage Today. "Any strain of H5N1 has the potential to reassort with another strain of influenza and become something more dangerous," Amesh ...

The H5N1 bird flu strain has infected humans and other animals in every continent except Australia, and scientists say it ...

Between 1968 and about 1977, the flu strain going around was more distantly related to H5N1, so people born in those years didn't have the same antibody response. And the picture becomes mixed in ...