What is the stomach bug going around right now? Norovirus 2025
The AMA Update covers a range of health care topics affecting the lives of physicians and patients. Learn more about norovirus, including signs, symptoms and treatment.
www.ama-assn.orgHere’s the latest overview based on recent reporting:
- What it is: Norovirus is a highly contagious virus that causes sudden vomiting and diarrhea. It spreads mainly through contaminated food or water, close contact with an infected person, and touching contaminated surfaces, then touching your mouth.[2][3]
- Current trend: There has been a notable surge in cases in parts of the United States for recent seasons, driven by emerging variants and waning population immunity to those variants; outbreaks have appeared on cruise ships and in schools, with some locations reporting earlier-than-usual activity.[1][3][2]
- Variant influence: A newer norovirus variant (often discussed as GII.17 and its descendants) has been associated with larger-than-average outbreak waves in some seasons, though surveillance data and interpretations vary by source; experts note that low immunity to new variants can contribute to rapid spread.[3][1]
- Severity and symptoms: Typical symptoms include nausea, vomiting, diarrhea, stomach cramps, and sometimes fever. Most people recover within 1–3 days, but dehydration can be a concern, especially for young children and older adults.[6][2]
- Public health guidance: Core prevention remains strict hand hygiene (soap and water is preferred over sanitizers for Norovirus), proper disinfection of contaminated surfaces (bleach-based cleaners are commonly recommended), staying home from work or school while symptomatic, and staying hydrated. There is currently no approved vaccine in widespread use, though vaccine candidates have been explored in clinical trials.[2][6]
- What to watch next: Public health agencies (CDC, UKHSA, etc.) continue monitoring outbreaks via surveillance networks; wastewater data and outbreak counts help gauge community transmission, but numbers can lag and vary by region.[5][3]
If you want, I can pull a brief, region-specific update for your area or recent advice from the CDC and local health departments. I can also provide a quick at-home prevention checklist and signs that indicate you should seek medical care.
Citations:
- Norovirus basics and transmission routes.[2]
- U.S. outbreak patterns and variant context; 2025–2026 season notes.[3]
- Seasonal surge, symptoms, and prevention guidance; surveillance and vaccine status.[6]