Nearly a year into the first outbreak of the bird flu among cattle, the virus shows no sign of slowing, but an investigation finds ongoing missteps by federal authorities.

California officials have declared a state of emergency over the spread of bird flu, which is tearing through dairy cows in ...

The Centers for Disease Control and Prevention called it the first severe case in the U.S., though the risk to most of the public is still low.

FILE -This colorized electron microscope image released by the National Institute of Allergy and Infectious Diseases on March 26, 2024, shows avian influenza A H5N1 virus particles (yellow), grown ...

H5N1 influenza has now been detected in pigs. This was something virologists had been worrying about ever since this highly pathogenic strain of bird flu started its rapid global spread in 2020. But ...