Stomach Flu FAQs

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    When is stomach flu season?

    Answer: December-April is the worst but it can occur all year round. 


    According to the CDC, rotavirus technically occurs from November-April1. However, my son got rotavirus in the middle of May. Norovirus gastroenteritis occurs all year round. I have no proof but I am fairly certain that the number of visitors to this website reflects the amount of stomach flu going around in the United States. The traffic is highest to this website December-April. Traffic is 3-4 times lower May-November. Even though, there seems to be the most stomach flu December-April, my family had a bad stomach bug in June so it is never actually gone.  --Annie Pryor, Ph.D.