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Norovirus is a very common and major cause of gastrointestinal illness. It most often circulates during the winter, but can cause illness throughout the year. Although it is sometimes called "stomach flu," it is not related to influenza. Symptoms of norovirus include diarrhea, vomiting and stomach pain. Healthy people usually recover within one to three days. Norovirus is highly contagious and spreads from person to person through contaminated food, water and objects that come in contact with the mouth. Frequent hand washing is the best way to prevent spread of norovirus.
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