Cases of norovirus — often called the “winter vomiting disease” — are climbing again across the United States, health officials say.
The highly contagious stomach virus typically causes sudden nausea, vomiting and diarrhea. Norovirus concentrations are up about 45% since November, with a sharp rise over the past three weeks, according to recent surveillance data. Activity is highest in the Midwest and Northeast, and outbreaks are also increasing on cruise ships.
Officials say the uptick began slightly earlier than usual and appears to be driven by a newer variant linked to a severe 2024–2025 season.
Each year in the U.S., norovirus causes an estimated 19 million to 21 million illnesses, 109,000 hospitalizations and about 900 deaths, according to the Centers for Disease Control and Prevention.
Health experts urge frequent handwashing, disinfecting contaminated surfaces and staying home when sick to help limit the spread.
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