The bird flu outbreak has spread to all 50 states, infecting dairy cattle, poultry farms and 61 humans across the country.

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.

As bird flu makes headlines with its first severe U.S. case, experts share crucial information about symptoms, risks, and ...

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.