In early May, just as the US government was about to implement a long-debated policy regulating gain-of-function research ...

Brazil, the world's largest poultry exporter, has confirmed its first outbreak of highly pathogenic avian influenza on a ...

Health officials are making a renewed call for vigilance against bird flu, but some experts are puzzling over why reports of ...

How dangerous is it? Where did it come from? H5N1 influenza’s origins stretch back to the 1990s, and key events paved the way ...