Norovirus

man wrapping his arm around his stomach

It's possible to get sick with norovirus at any time of the year, but illnesses are most common between November and April.  Outbreaks happen in restaurants, schools and childcare facilities, cruise ships, healthcare facilities, camps, and other places where large groups of people gather and share common spaces or food.

Raw oysters are a common cause of norovirus outbreaks in California and the U.S. Oysters can become contaminated with norovirus if they are grown or processed in water that is contaminated with human sewage. If people eat raw or undercooked oysters, they can get sick from norovirus.

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