Cases of norovirus, also known as the stomach flu, are surging across the United States as the new year begins. The highly contagious virus, which causes intense bouts of diarrhea and vomiting, is causing a record number of outbreaks for this time of year.

Centers for Disease Control and Prevention. Health experts expect more cases when the season reaches its peak in mid-January. Norovirus, typically from contaminated food or water, is a leading cause of vomiting and diarrhea.