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Norovirus cases are rising sharply in the U.S., driven by a highly contagious variant, with outbreaks in schools, cruise ships, and hospitals.
Norovirus cases are surging across the U.S., with a 45% increase since November and early outbreaks in schools, cruise ships, and healthcare facilities, driven by the more contagious GII.17 variant.
Wastewater data show rising levels, especially in the Midwest and Northeast, though outbreak numbers remain near average.
The virus, which causes vomiting and diarrhea, spreads easily and is not effectively killed by hand sanitizer—only soap and water work.
The CDC does not track norovirus via wastewater, but external data indicate an early, sharp rise.
Experts warn cases could worsen before peaking, urging hygiene and staying home when sick.
Norovirus causes millions of infections, tens of thousands of hospitalizations, and hundreds of deaths annually.
Los casos de norovirus están aumentando bruscamente en los EE.UU., impulsados por una variante altamente contagiosa, con brotes en escuelas, cruceros y hospitales.