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photo of a group of people sitting around a table full of foodNorovirus 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... more

Vital Signs

CDC Vital Signs Report

Preventing Norovirus Outbreaks, Food Service has a Key Role
Norovirus is the leading cause of disease outbreaks from contaminated food in the United States. Learn about food safety practices that can help prevent these outbreaks.

Norovirus Topics

About Norovirus

Overview about the virus, how it spreads, symptoms, treatment...

Preventing Norovirus Infection

You can help protect yourself and others from norovirus infection by following some simple tips...

For Food Workers

Information about how norovirus spreads through contaminated food and water...

For Health Care Providers

Clinical features, transmission, diagnosis, disease burden, treatment...

For Public Health Professionals

Information about burden of norovirus illness and outbreaks, surveillance & reporting, investigations...

Laboratory Testing

Types of laboratory testing done to diagnose norovirus infection, guidelines, reporting systems...

Trends and Outbreaks

Information about how common norovirus illness is, who gets infected, and when...

Reporting and Surveillance

Information about norovirus reporting for health care providers and health departments, description of several norovirus surveillance systems...

Resources & References

Scientific articles and educational materials related to norovirus...


Lists norovirus web features, podcasts, videos, infographic and web widget...

Norovirus accounted for 48% of single known causes of foodborne illness outbreaks in the U.S. from 2009 through 2012. Bacteria accounted for 46%, chemical and toxins 6% and parasites and other accounted for 1% each.
How contagious is norovirus?
CDC Norovirus Disease Widget. Flash Player 9 or above is required.
CDC Norovirus Disease Widget.
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Norovirus Outbreaks

Norovirus outbreaks occur throughout the year. But, over 80% of the outbreaks occur from November to April. In this data & statistics feature, learn about Surveillance for Norovirus Outbreaks.

Review other norovirus multimedia tools.

Many Names, Same Symptoms

Woman with a stomachache.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.

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Hands Off Norovirus

CDC Featured Podcast

Dr. Aron Hall discusses how food handlers can prevent the spread of norovirus with HealthBeat’s Ira Dreyfuss.

Listen To This Podcast (1:00)

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