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 CDC ends its emergency response to H5N1 bird flu after recording 70 human cases and one death nationally, even as experts ...

The shift reflects the current public health situation, marked by declines in human cases as well as animal detections ...

Doctors and researchers said the moves will make it harder to detect potentially dangerous changes. If the virus continues to ...