Norovirus incubation period

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    What Are the Symptoms of Norovirus and How Long Do They Last?

    Key Takeaways

    • Norovirus, also known as the stomach flu, is a highly contagious virus that can cause nausea, vomiting, stomach cramps, and diarrhea.

    • Experts say most people can recover from illness in about one to three days after symptoms begin, however, that can vary by person.
    • There is no vaccine or medication to treat norovirus, but experts say the best way to protect yourself is to wash your hands frequently.

    Norovirus, an extremely contagious stomach bug, is making its way across the United States and other parts of the world.

    It can lead to gastroenteritis (stomach flu), causing symptoms such as vomiting, nausea, stomach pain, and diarrhea.

    As of Feb. 28, the average positive rate of norovirus tests was around 17%, higher than last season’s peak at about 15% in March 2022, according to data from the Centers for Disease Control and Prevention (CDC).

    States including California, Michigan, and Virginia are particularly seeing cases of norovirus outbreaks.

    Sara Mirza, PhD, MPH, an epidemiologist at

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