Surveillance data from the Centers for Disease Control and Prevention (CDC) indicate a spike in norovirus outbreaks in the United States.

Know someone with a stomach bug this holiday season? They're not alone -- cases of norovirus are surging in parts of the United States this winter, according to data from to the Centers for Disease Control and Prevention.

A sharp increase in norovirus cases is sweeping the United States, according to the latest data from the Centers for Disease Control and Prevention (CDC). Often called the "stomach flu," norovirus is a leading cause of gastroenteritis,

Respiratory illness activity is currently considered "high" in the United States, according to the CDC. In one state, it is at a "very high" level.