Who gets norovirus infection?

Anyone can become infected with these viruses. There are many different strains of norovirus, which makes it difficult for a person's body to develop long-lasting immunity. Therefore, norovirus illness can recur throughout a person's lifetime. In addition, because of differences in genetic factors, some people are more likely to become infected and develop a more severe illness than others.

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1. What are noroviruses?
2. How long are people contagious?
3. Who gets norovirus infection?
4. What treatment is available for people with norovirus infection?