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flag A new norovirus strain is spreading rapidly across the U.S., causing widespread illness with no vaccine or treatment available.

flag Norovirus is spreading earlier and faster across the U.S. in the 2024-2025 season, driven by a new strain, GII.17, which many lack immunity to. flag Cases are rising in states including Massachusetts, Connecticut, Michigan, Indiana, and Texas, with outbreaks in schools, homes, and healthcare facilities. flag Symptoms—vomiting, diarrhea, cramps—appear 12 to 48 hours after exposure and last one to three days, posing serious dehydration risks for young children, older adults, and immunocompromised people. flag The virus spreads via contact, contaminated food or surfaces, and airborne particles, surviving for days and remaining contagious after symptoms end. flag Prevention relies on handwashing with soap and water, bleach-based disinfection, avoiding contact with sick individuals, and staying home until at least two to three days after symptoms resolve. flag No vaccine or specific treatment exists, so hydration and hygiene are critical. flag The CDC estimates norovirus causes millions of illnesses, tens of thousands of hospitalizations, and hundreds of deaths annually, with cases expected to peak through winter.

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