Norovirus infection occurs in the stomach and intestines. It is most often call the stomach flu. Outbreaks often occur in areas with close contact such as: Cruise shipsRestaurantsNursing homesHospitals
The Digestive Tract
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These infections are caused by a specific group of viruses. The viruses can spread through: Contaminated water supplies such as recreational lakes, swimming pools, wells, and water stored on cruise shipsRaw or improperly steamed shellfish, especially clams and oystersFood and drinks prepared by infected food handlers who either do not wash their hands properly after using the bathroomSurfaces, such as a door knob
The viruses can also spread by direct contact with an ill person. This is common in a daycare center or nursing home.
Any person who ingests the virus is at risk of getting this infection. Older children and adults commonly get this infection.
Even if you have been infected with norovirus in the past, you can become ill again if: You are exposed to a different type of norovirusYour last illness was more than 24 months ago
If you have any of these do not assume it is due to norovirus. These may be caused by other health conditions. Symptoms may include: NauseaVomitingDiarrheaAbdominal painHeadacheLow-grade feverChillsMuscle achesTiredness
Symptoms often appear within 24-48 hours of exposure to the virus. Symptoms often last about 24-60 hours.
Your doctor will ask about your symptoms and medical history. A physical exam will be done.
Your doctor may determine you have a stomach flu from your symptoms. It is rarely necessary to determine the exact virus causing the infection. Stool and blood samples may be taken if your doctor wants to know the exact type of virus causing the problem.
A norovirus infection will go away on its own. Medical treatment is often not needed since the illness is often brief and mild.
Most people will recover by resting and drinking plenty of fluids. Oral rehydration solutions are the best option to help replace fluids and electrolytes. These can be found in most drugstores. Severe dehydration may require IV fluids in a hospital but this is a rare complication.
Antibiotics are not effective against viruses. There are no antiviral medications or vaccines used to fight or prevent this infection.
To help reduce your chance of getting or passing noroviruses take the following steps: Wash your hands
thoroughly with soap and water:
After using the bathroomAfter changing diapersBefore preparing or eating food.If you are caring for someone who is infected, make sure the person thoroughly washes his or her hands.If you are ill or caring for someone who is ill, immediately clean and disinfect contaminated surfaces using bleach cleaner. Remove and wash soiled linens. Use hot water and soap.Wash fruits and vegetables.Cook oysters and clams before eating them.Do not prepare food if you have symptoms. Wait three days after you have recovered before handling food again.Throw away contaminated food.If you are sick, do not attend work until symptoms have passed.
Norovirus. Centers for Disease Control and Prevention website. Available at:
http://www.cdc.gov/norovirus/about/overview.html. Updated April 12, 2012. Accessed February 20, 2013.
Norovirus infection. EBSCO DynaMed website. Available at:
http://www.ebscohost.com/dynamed. Updated January 25, 2013. Accessed February 20, 2013.
Norovirus illness: Key facts: Centers for Disease Control and Prevention website. Available at:
http://www.cdc.gov/norovirus/downloads/keyfacts.pdf. Accessed February 20, 2013.
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Last reviewed June 2014 by Fabienne Daguilh, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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