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The Yolo County Health & Human Services Agency puts the case count at 4,001. The outbreak prompted the closure of several county schools just prior to the Memorial Day weekend.
Suspect norovirus cases have been reported in Santa Barbara, Santa Clara and Sacramento Counties.
The Centers for Disease Control and Prevention (CDC) estimates that there are between 19-21 million cases of norovirus illness each year in the U.S. Additionally, CDC estimates that norovirus contributes to 56,000-71,000 hospitalizations and 570-800 deaths each year in the U.S.
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