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.

The U.S. Centers for Disease Control and Prevention (CDC) announced the end of the bird flu emergency, at least for now.

The U.S. Centers for Disease Control and Prevention ended its emergency response for bird flu as the outbreak that sickened dozens of people, spread to cattle and drove up ...

The CDC ends its emergency response to H5N1 bird flu after recording 70 human cases and one death nationally, even as experts note seasonal patterns may increase fall cases.  Read More ...