Blacklow NR. Epidemiology of viral gastroenteritis in adults. Longo DL, et al. Viral gastroenteritis. In: Harrison's Principles of Internal Medicine. New York, N. Rochester, Minn. Alexandraki I, et al. Ask your doctor about how to deal with dehydration. It is a link for moving within the page. Go to the main. Updated October 2, Whipple disease.
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People get norovirus by accidentally ingesting tiny amounts of these feces or vomit, which can be found on unwashed food, in contaminated water, or on a contaminated surface.
People with the infection can release billions of norovirus particles; it only takes a small amount of those particles to make someone sick, according to the CDC. More than half of all norovirus outbreaks in the United States occur in long-term care facilities, notes the CDC. About 1 percent of all reported norovirus outbreaks occur on cruise ships. Norovirus can also be detected in a stool sample. If you have an underlying health issue or weakened immune system, your doctor may want to order a stool test.
Most people will recover from norovirus without needing any treatment, but older adults, small children, and people with underlying medical conditions can be more susceptible to dehydration , and may therefore require medical treatment or even a hospital stay.
Although the symptoms usually only last for a few days, people are contagious for much longer. Some people can keep shedding the virus in their feces for weeks — or even months, if you have underlying conditions — after recovering from the infection.
Because there are many different types of norovirus, you can get sick from it many times. If you have an infection, the best course of action is to rest and drink plenty of fluids to prevent dehydration. There is currently no vaccine available for norovirus, according to the CDC.
Some steps to take include:. Some people, however, are more at risk for severe dehydration from norovirus, especially pregnant women or people who are older or have weakened immune systems.
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