New versions of the H5N1 virus are increasingly adept at spreading. Suggestions to either let it rip in poultry or vaccinate the birds could backfire.

Although the avian flu (H5N1) virus may not be making the news as frequently, it is still working hard behind the scenes, ...

"This is the first case of H5N1 bird flu in the U.S. that has been linked to exposure to a backyard flock." The confirmation comes weeks after the first case of bird flu was found in a child ...

The bird flu that’s been making news in the United States is a virus called H5N1. Some flu viruses carried by birds cause only mild infections and are classified as low-pathogenic viruses.

Cambodia's Ministry of Health recently confirmed the country's twelfth human case of H5N1 avian influenza so far this year.

The U.S. Centers for Disease Control and Prevention said on Monday it has ended its emergency response for H5N1 bird flu, ...