Norovirus is spreading earlier again this year, wastewater data shows
Last year's outbreaks were the largest in a decade, fueled by an emerging variant of the highly contagious, hard-to-kill virus. What will this year look like?
www.nbcnews.comHere’s a quick update on norovirus based on recent reporting.
- What it is now: Norovirus remains a highly contagious stomach bug that causes vomiting and diarrhea. Recent coverage notes a renewed surge in cases and outbreaks in multiple regions, with wastewater data showing elevated levels in parts of the U.S. and ongoing transmission on cruise ships and in schools.[1][2][8]
- Why it’s happening: A shift in circulating variants (notably a rise in GII.17 in past seasons) and waning population immunity against newer variants are cited as contributors to renewed spread.[2]
- What to watch for: Authorities have warned that outbreaks may continue to rise through the season in some areas, though overall outbreak counts may still fall short of peaks seen in the worst recent years; common symptoms include vomiting, diarrhea, abdominal cramps, and sometimes fever or body aches.[8][2]
- Prevention and care: Standard precautions remain key—handwashing, surface disinfection, and isolation of symptomatic individuals to limit spread. If symptoms are severe or dehydration is a concern, seek medical advice; there is currently no approved vaccine in wide use, though vaccine candidates have been in late-stage trials.[1][8]
- Where to find ongoing updates: Major outlets are tracking seasonality and outbreaks, including CDC updates and UK government surveillance for the UK season, which can provide context for trends in other regions as well.[4][8]
If you’d like, I can pull the latest local updates for Valletta or Malta specifically, or summarize guidance from health authorities for travelers and households.