A little-known variant of bird flu has evolved to become better adapted to infecting people and could pose a pandemic threat to humans, a team of researchers has warned.

Health officials are making a renewed call for vigilance against bird flu, but some experts are puzzling over why reports of new human cases have stopped. Has the search for cases been weakened by ...

When you think of birds imitating sounds, parrots and starlings might come to mind. They're famous for copying human speech, car alarms, and even ringtone melodies. But what happens when you challenge ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. Health officials are making a renewed call ...