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.

A person in Louisiana has been hospitalized with a severe case of the bird flu. It is the first known human H5N1 infection in the United States, according

Highly contagious H5N1 avian influenza, or “bird flu,” has been found in a Mississippi chicken flock. It’s the first major case of bird flu in Mississippi since 2023.