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. What are the symptoms of illness caused by noroviruses?
3. What is the name of the illness caused by noroviruses?
4. How serious is norovirus disease?
5. How do people become infected with noroviruses?
6. When do symptoms appear?
7. Are noroviruses contagious?
8. How long are people contagious?
9. Who gets norovirus infection?
10. What treatment is available for people with norovirus infection?
11. Can norovirus infections be prevented?