A group of viruses cause this infection. They can spread through:
- Water that is not clean, such as lakes, swimming pools, wells, and water stored on cruise ships
- Raw or poorly steamed shellfish, such as clams and oysters
- Food and drinks made by food handlers who have the infection and do not wash their hands well after using the bathroom
- Surfaces, such as a door knob
The viruses can also spread by being around someone who is sick.
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
Edits to original content made by Denver Health.
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a (Acute Nonbacterial Gastroenteritis; Caliciviruses; Food Infection; Norwalk Virus; Norwalk-like Virus; Small Round Structure Viruses [SMRVs]; Stomach Flu; Viral Gastroenteritis)
Centers for Disease Control and Prevention http://www.cdc.gov
National Institute of Allergies and Infectious Diseases http://www.niaid.nih.gov
Health Canada https://www.canada.ca
Public Health Agency of Canada http://www.phac-aspc.gc.ca
Bok K, Green KY. Norovirus gastroenteritis in immunocompromised patients. N Engl J Med. 2012 Nov 29;367(22):2126-2132.
Norovirus. Centers for Disease Control and Prevention website. Available at: http://www.cdc.gov/norovirus/about/overview.html. Accessed October 30, 2020.
Norovirus infection. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/norovirus-infection. Accessed October 30, 2020.