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This transmission electron micrograph (TEM) revealed some of the ultrastructural morphology displayed by norovirus virions, or virus particles.

Electron micrograph(TEM) of Norovirus



What is Norovirus?

Noroviruses are a group of viruses that cause the "stomach flu" or gastroenteritis 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:


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


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


How do people get norovirus infections?



  • Eating food or drinking liquids that are contaminated with norovirus




Can I catch norovirus from someone?

Yes, norovirus is very contagious and can spread easily from person to person. Both stool and vomit are infectious. Particular care should be taken with young children in diapers who may have diarrhea. People infected with norovirus are contagious from the moment they begin feeling ill to at least 3 days after recovery. Therefore, it is particularly important for people to use good handwashing and other hygienic practices after they have recently recovered from norovirus illness.

How can I protect myself and my family from getting sick with norovirus?






What are the signs of norovirus?



Is there a cure for norovirus?

There is no cure for norovirus, however almost all people who get norovirus infection recover completely without any long-term problems. The most important thing to do for people with norovirus infection is prevent severe loss of fluids (dehydration). Dehydration among young children, the elderly, and the sick, can be common, and it is the most serious health effect that can result from norovirus infection. By drinking oral rehydration fluids, juice, or water, people can reduce their chance of becoming dehydrated. Sports drinks do not replace the nutrients and minerals lost during this illness. Medications, including antibiotics (which have no effect on viruses) and other treatments, should be avoided unless specifically recommended by a physician.

Useful norovirus links and documents
