The United States Centers for Disease Control and Prevention reported 91 outbreaks of norovirus, or stomach flu, in the first week of December.

Federal health officials have confirmed unsettling new details about the first United States case of severe bird flu, reported recently in a hospitalized patient in Louisiana. Genetic samples from the patient contained mutations that could,

The Centers for Disease Control and Prevention and other federal agencies are closely monitoring the spread of the HN51 avian influenza, commonly known as the bird flu, nationwide after human cases increased to at least 66.