What are noroviruses?

Noroviruses are a group of viruses that cause the "stomach flu," or gastroenteritis (GAS-tro-enter-I-tis), in people. The term norovirus was recently approved as the official name for this group of viruses. Several other names have been used for noroviruses, including:

  • Caliciviruses (because they belong to the virus family Caliciviridae)
  • Norwalk-like viruses (NLVs)
  • Small round structured viruses

Viruses are very different from bacteria and parasites, some of which can cause illnesses similar to norovirus infection. Viruses are much smaller, are not affected by treatment with antibiotics, and cannot grow outside of a person's body.

Show All Answers

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?