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Noroviruses are the most common cause of acute gastroenteritis in the United States and account for almost 60% of all foodborne outbreaks. Norovirus is a highly contagious virus and leads to diarrhea, vomiting, and stomach pain. Norovirus illness is often called by other names, such as food poisoning and stomach flu. However, norovirus illness is not related to the flu (influenza), which is a respiratory illness caused by influenza virus.