What are noroviruses?

Noroviruses are a group of related viruses that affect the intestinal tract causing gastroenteritis illness. This group of viruses has been also referred to as caliciviruses and Norwalk-like viruses. These viruses are an important cause of gastrointestinal illness throughout the United States, including Illinois.

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1. What are noroviruses?
2. What are the symptoms of noroviruses?
3. How common is norovirus infection?
4. How do people come in contact with these viruses?
5. How can these infections be prevented?