CDC Reports Cases of Norovirus on the Rise Nationwide

A norovirus case is usually characterized by the sudden onset of vomiting and diarrhea, authorities say.

The Centers for Disease Control and Prevention headquarters in Atlanta on April 23, 2020. (Tami Chappell/AFP via Getty Images

Cases of a stomach virus have been on the rise across the United States in recent months, according to new data released by the Centers for Disease Control and Prevention (CDC).

Around 14 percent of tests for norovirus came back positive for the most recent week that ended Nov. 15, the CDC said in a report updated on Nov. 21. That’s about double from roughly three months ago in mid-August.