The US should worry about the avian flu 'because it could be another pandemic', an infectious diseases expert said.

Among animals, more than 169 million commercial poultry or backyard birds have been infected in the current H5N1 outbreak, ...

Bird flu is continuing to spread in animals across the U.S. Here's what you need to know about the current situation.

Public health experts share concerns that the H5N1 bird flu outbreak could turn into a pandemic. What to know after Louisiana ...