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What to know about norovirus as Bay Area holiday gatherings ramp up

A new GII.17 norovirus strain, highly contagious with as few as 5–10 particles needed for infection, drives seasonal surges during Bay Area holiday gatherings, officials say.

Summary by The Mercury News
The first major mutation of the virus in about 30 years has made it more contagious.

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The Mercury news broke the news in San Jose, United States on Wednesday, December 17, 2025.
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