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 Centers for Disease Control and Prevention ended its emergency response to bird flu as the outbreak that sickened dozens of people, spread to cattle, and drove up egg prices has abated.

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

Mercury-based preservative thimerosal is in the spotlight, as a CDC committee votes to recommend single-dose flu vaccines without the controversial ingredient for all age groups.

A CDC panel recommended against flu vaccines with thimerosal, a preservative falsely linked to autism. Experts warn the decision may raise vaccine costs unnecessarily.