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US Norovirus Cases Surge: Double Since August, CDC Warns

Source: US cases of norovirus on the rise with double the rate of positive tests since August (2025-11-26)

The recent surge in norovirus cases across the United States has raised significant public health concerns. According to the CDC, positive test rates have doubled since August, with nearly 14% of tests returning positive by mid-November, compared to 7% three months prior. This increase underscores a broader trend of rising gastrointestinal illnesses, which are now impacting hospitals, schools, and cruise ships nationwide. Experts attribute this spike to seasonal factors, increased travel, and potential lapses in hygiene practices. Notably, norovirus is highly contagious, spreading through contaminated food, water, and surfaces, and can cause severe dehydration, especially in vulnerable populations like children and the elderly. The CDC emphasizes the importance of rigorous handwashing, disinfecting surfaces, and staying home when symptomatic to curb transmission. Recent developments include the emergence of new norovirus strains, which may evade some immunity, and the ongoing impact of climate change, which influences virus survival and spread. Additionally, the rise in cases coincides with increased international travel and the reopening of global borders, facilitating virus transmission. Public health officials are urging communities to remain vigilant, especially during the upcoming holiday season, when gatherings can accelerate outbreaks. As researchers continue to study norovirus's evolving nature, vaccine development remains a priority, with several candidates in advanced clinical trials expected to be available within the next few years. This surge highlights the need for enhanced public health strategies, including improved sanitation infrastructure and public awareness campaigns, to prevent future outbreaks and protect vulnerable populations.

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