The virus has spread among dairy cattle, humans and other mammals. But officials say the current public health risk is low.

The bird flu virus found in a severely ill patient hospitalized in the United States has mutated to become better adapted to ...

The CDC has confirmed a total of 66 human cases of bird flu across the United States as of Friday, although the number is ...

Although the risk to the general public is still considered low, there have been at least 65 confirmed human cases in the U.S ...

Vermont officials reported an H5N1 bird flu outbreak in a backyard flock, leading to the culling of affected birds.

The agency, in its latest update released Thursday, said the mutations were not found in samples taken from wild birds, suggesting the virus changed over the course of the patient’s infection.