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Español: Norovirus

Norovirus is a very contagious virus that can infect anyone. You can get it from an infected person, contaminated food or water, or by touching contaminated surfaces. The virus causes your stomach or intestines or both to get inflamed. This leads you to have stomach pain, nausea, and diarrhea and to throw up. These symptoms can be serious for some people, especially young children and older adults...


New Report Available

Global Burden report.

Global Burden of Norovirus and Prospects for Vaccine Development [4.39 MB, 46 pages] brings together the work of norovirus researchers from around the world to describe the burden of norovirus globally and outline further research needed to fill gaps in knowledge in order to make norovirus vaccines a reality.

CDC Norovirus Disease Widget. Flash Player 9 or above is required.
CDC Norovirus Disease Widget.
Flash Player 9 or above is required.

Norovirus Outbreaks

Norovirus outbreaks occur throughout the year. But, over 80% of the outbreaks occur from November to April. Learn more about U.S. Trends and Outbreaks.

Review other norovirus multimedia tools.


The most common symptoms are:

Woman with a stomachache
  • diarrhea
  • throwing up
  • nausea
  • stomach pain

Other symptoms include:

  • fever
  • headache
  • body aches

You can get dehydrated if you are not able to drink enough liquids. You may urinate less, have a dry mouth and throat, and feel dizzy.


Many Names, Same Symptoms

You may hear norovirus illness called "food poisoning" or "stomach flu." It is true that food poisoning can be caused by noroviruses. But, other germs and chemicals can also cause food poisoning.

Norovirus illness is not related to the flu, which is a respiratory illness caused by influenza virus.