Cases of a wretched stomach bug, norovirus, are surging in parts of the United States this winter, according to government data.

Cases of a wretched stomach bug are surging in parts of the United States this winter, according to government data. The most recent numbers from the U.S. Centers for Disease Control and Prevention show there were 91 outbreaks of norovirus reported during the week of Dec.

A genetic analysis suggests the bird flu virus mutated inside a Louisiana patient who contracted the first severe case of the illness in the United States. The U.S.

The U.S. Centers for Disease Control and Prevention said on Thursday its analysis of samples from the first severe case of bird flu in the country last week showed mutations not seen in samples from an infected backyard flock on the patient's property.

Samples from a hospitalized patient in Louisiana show changes that could make the H5N1 virus spread more easily between humans