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

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.