The H5N1 bird-flu virus has infected a third person in the US, this time with respiratory symptoms. The new patient's cough and sore throat could help the virus get better at infecting humans.

Michigan's health department announced Thursday a human case of bird flu in a dairy worker. It's the third human case reported to date in the current U.S. avian flu outbreak among dairy cows. Unlike ...

Another case of bird flu has been detected in Philadelphia, according to the city health department. Health officials say the ...

So far, 67 human bird flu cases have been confirmed in the U.S., the CDC says. A child in San Francisco was recently confirmed to be the third human case of bird flu in the United States in which it's ...