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.

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

A person in Louisiana became the first to be diagnosed with a severe case of the bird flu after possibly being exposed to sick and dead birds on their property, the Centers for Disease Control said on Wednesday.