Add Yahoo as a preferred source to see more of our stories on Google. The first human to have ever been infected with the H5N5 strain of bird flu has died, Washington state health officials ...

H5N1 bird flu has infected growing numbers of people worldwide in recent years, but this week saw something new: the first recorded human case of an H5N5 avian influenza virus. What is this virus ...

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 ...