The U.S. Centers for Disease Control 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.

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.

Last week, the case was confirmed in a Louisiana resident over the age of 65, who was experiencing serious respiratory issues.

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

This marks the first case of H5N1 bird flu in the US connected to backyard flock exposure, according to health officials.

Public health officials are investigating the first human case of H5 bird flu detected in Los Angeles County, it was announced Monday. The victim, an adult who was exposed at a worksite to livestock infected with H5 bird flu,

Public health officials have just reported the first known “severe” case of bird flu in the United States. There are now 61 confirmed cases across eight states. This week, the Centers for Disease Control and Prevention (CDC) announced that a person had been hospitalized with a “severe case” of bird flu.