Norovirus is spreading across the U.S. at a highly elevated rate this winter.

“Norovirus, also known as the dreaded stomach flu, is surging across the United States in 2025 – including the Garden State,” warned the Ocean County Department of Health. “The highly contagious gastrointestinal bug, which causes sudden bouts of vomiting and diarrhea, is causing a record number of outbreaks in the U.S for this time of year, according to the CDC.