The U.S. Centers for Disease Control and Prevention said on Thursday its analysis of samples from the first severe case of bird flu in the country last week showed mutations not seen in samples from an infected backyard flock on the patient's property.

The United States Centers for Disease Control and Prevention said on Thursday that its analysis of samples from the first severe case of bird flu in the country showed mutations that were

Here’s what to know about the United States’ first confirmed severe case of H5N1 avian influenza—and how to protect yourself.

California’s battle with bird flu has been intensified as two new confirmed cases have been found in Stanislaus and Los Angeles counties. The rate at which the flu lathers has led California Governor Gavin Newsom to declare a state of emergency on December 18.