What are the symptoms of illness caused by noroviruses?

The symptoms of norovirus illness usually include nausea, vomiting, diarrhea, and some stomach cramping. Sometimes people additionally have a low-grade fever, chills, headache, muscle aches, and a general sense of tiredness. The illness often begins suddenly, and the infected person may feel very sick. The illness is usually brief, with symptoms lasting only about 1 or 2 days. In general, children experience more vomiting than adults. Most people with norovirus illness have both of these symptoms.

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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?