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 said on Monday it has ended its emergency response for H5N1 bird flu, ...

HHS Secretary Robert F. Kennedy Jr. and Secretary of Agriculture Brooke Rollins have expressed interest in letting H5N1 ...