The easiest way to become infected by norovirus is to consume food that has been contaminated by norovirus particles. It takes a mere 100 norovirus particles to make you sick, making this one of the most common causes of gastroenteritis. If you have recently consumed food and start feeling sick, you should carefully monitor symptoms. Or if you notice fever, vomiting, or diarrhea, contact your doctor for further evaluation. If you only have diarrhea, you should drink plenty of water to stay hydrated, and contact your doctor if it lasts for more than a few days.

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