--- title: What is Norovirus? date: 2026-07-05T09:55:00-07:00 author: Bill Marler canonical_url: "https://marlerclark.com/news_events/what-is-norovirus" section: News --- [All News](/news_events) / [Firm News](https://marlerclark.com/news_events/firm-news) / # What is Norovirus? ***Norovirus*** Norovirus is the single most common cause of foodborne illness in the United States, responsible for roughly half of all outbreaks and some twenty million illnesses a year. It is ferociously contagious, spreads readily from an infected food handler, and can move through a restaurant, a cruise ship, or a catered event in a matter of hours. [Marler Clark, The Food Safety Law Firm](https://marlerclark.com/), is the nation’s leading firm representing victims of [norovirus](https://about-norovirus.com/)outbreaks. Our [norovirus lawyers](https://marlerclark.com/food-litigation/norovirus-outbreak-litigation) have represented thousands of victims in the only U.S. law practice devoted exclusively to foodborne illness, which has recovered more than $850 million for victims and families nationwide. We have handled [norovirus](https://about-norovirus.com/) cases traced to a wide range of food products and restaurants. If you or a family member became ill with [norovirus](https://about-norovirus.com/) after eating contaminated food, contact the Marler Clark [norovirus](https://about-norovirus.com/) attorneys for a free case evaluation. **FAQ** **What is norovirus?** Norovirus is the most common cause of foodborne illness in the United States, responsible for roughly half of all outbreaks and about 20 million illnesses a year. It is extremely contagious and spreads rapidly from an infected food handler, causing sudden vomiting and diarrhea that usually last one to three days. **How does norovirus spread through food?** An infected food handler can contaminate food or surfaces, and it takes only a few viral particles to make someone sick. Ready-to-eat foods such as salads, sandwiches, and shellfish are common vehicles. **How long does norovirus last?** Symptoms usually begin 12 to 48 hours after exposure and last one to three days. People can remain contagious for days after they feel better. **Can a restaurant be liable for a norovirus outbreak?** Yes. When a sick employee who should have been kept out of the kitchen causes an outbreak, the restaurant may be liable for the resulting illnesses. **What evidence helps a norovirus claim?** A health-department investigation linking illnesses to a specific meal or establishment, together with your own medical records and receipts, is often key. **Additional Resources:** - • [About Norovirus](https://about-norovirus.com/) — a complete online resource on norovirus and its spread ### Other Norovirus Lawsuits [240 with Norovirus linked to Sushi Nine](https://marlerclark.com/240-with-norovirus-linked-to-sushi-nine) [Norovirus Outbreak Tied to Illinois Restaurant Monical's Pizza](https://marlerclark.com/norovirus-outbreak-tied-to-illinois-restaurant-monicals-pizza) [CDC now reports Norovirus Oyster Outbreak growing - 192 ill in United States](https://marlerclark.com/norovirus-outbreak-linked-to-raw-oysters-sickens-hundreds) [23 sickened in Norovirus Outbreak linked to Habit Burger Grill in 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1998](https://marlerclark.com/news_events/case-news?illness=all&year=1998) [Foodborne Illness Lawsuits in 1999](https://marlerclark.com/news_events/case-news?illness=all&year=1999) [Foodborne Illness Lawsuits in 2000](https://marlerclark.com/news_events/case-news?illness=all&year=2000) [Foodborne Illness Lawsuits in 2001](https://marlerclark.com/news_events/case-news?illness=all&year=2001) [Foodborne Illness Lawsuits in 2002](https://marlerclark.com/news_events/case-news?illness=all&year=2002) [Foodborne Illness Lawsuits in 2003](https://marlerclark.com/news_events/case-news?illness=all&year=2003) [Foodborne Illness Lawsuits in 2004](https://marlerclark.com/news_events/case-news?illness=all&year=2004) [Foodborne Illness Lawsuits in 2005](https://marlerclark.com/news_events/case-news?illness=all&year=2005) [Foodborne Illness Lawsuits in 2006](https://marlerclark.com/news_events/case-news?illness=all&year=2006) [Foodborne Illness Lawsuits in 2007](https://marlerclark.com/news_events/case-news?illness=all&year=2007) [Foodborne Illness Lawsuits in 2008](https://marlerclark.com/news_events/case-news?illness=all&year=2008) [Foodborne Illness Lawsuits in 2009](https://marlerclark.com/news_events/case-news?illness=all&year=2009) [Foodborne Illness Lawsuits in 2010](https://marlerclark.com/news_events/case-news?illness=all&year=2010) [Foodborne Illness Lawsuits in 2011](https://marlerclark.com/news_events/case-news?illness=all&year=2011) [Foodborne Illness Lawsuits in 2012](https://marlerclark.com/news_events/case-news?illness=all&year=2012) [Foodborne Illness Lawsuits in 2013](https://marlerclark.com/news_events/case-news?illness=all&year=2013) [Foodborne Illness Lawsuits in 2014](https://marlerclark.com/news_events/case-news?illness=all&year=2014) [Foodborne Illness Lawsuits in 2015](https://marlerclark.com/news_events/case-news?illness=all&year=2015) [Foodborne Illness Lawsuits in 2016](https://marlerclark.com/news_events/case-news?illness=all&year=2016) [Foodborne Illness Lawsuits in 2017](https://marlerclark.com/news_events/case-news?illness=all&year=2017) [Foodborne Illness Lawsuits in 2018](https://marlerclark.com/news_events/case-news?illness=all&year=2018) [Foodborne Illness Lawsuits in 2019](https://marlerclark.com/news_events/case-news?illness=all&year=2019) [Foodborne Illness Lawsuits in 2020](https://marlerclark.com/news_events/case-news?illness=all&year=2020) [Foodborne Illness Lawsuits in 2021](https://marlerclark.com/news_events/case-news?illness=all&year=2021) [Foodborne Illness Lawsuits in 2022](https://marlerclark.com/news_events/case-news?illness=all&year=2022) [Foodborne Illness Lawsuits in 2023](https://marlerclark.com/news_events/case-news?illness=all&year=2023) [Foodborne Illness Lawsuits in 2024](https://marlerclark.com/news_events/case-news?illness=all&year=2024) [Foodborne Illness Lawsuits in 2025](https://marlerclark.com/news_events/case-news?illness=all&year=2025) [Foodborne Illness Lawsuits in 2026](https://marlerclark.com/news_events/case-news?illness=all&year=2026) ##### Get Help #### Affected by an outbreak or recall? The team at Marler Clark is here to answer all your questions. Find out if you’re eligible for a lawsuit, what questions to ask your doctor, and more. [ Get a free consultation ](https://marlerclark.com/contact) ##### Related Resources ###### [Norovirus Food Poisoning](https://marlerclark.com/foodborne-illnesses/norovirus/about-norwalk) What is Norovirus? When someone talks about having “the stomach flu,” they are probably describing acute-onset gastroenteritis caused by one of the noroviruses, which are members of the “calcivirus” family... ###### [Symptoms and Risks of Norovirus Infection](https://marlerclark.com/foodborne-illnesses/norovirus/norwalk-symptoms-risks) Norovirus causes a relatively short, intense illness characterized by nausea, vomiting, diarrhea, and abdominal cramping. The most common symptoms are sudden onset of vomiting and watery diarrhea, although stomach cramps... ###### [How is Norovirus Infection Diagnosed?](https://marlerclark.com/foodborne-illnesses/norovirus/norwalk-diagnosis) Norovirus can be detected in an infected person’s stool or vomit through laboratory testing. Diagnosis of norovirus illness is based on the combination of symptoms, particularly the prominence of vomiting... ###### [Treatment for Norovirus Infection](https://marlerclark.com/foodborne-illnesses/norovirus/norwalk-treatment) Norovirus typically resolves without treatment; however, dehydration is a concern. Collecting a stool sample and using molecular methods to find viral RNA is the preferred method to test for norovirus... ###### [Preventing Norovirus Infection](https://marlerclark.com/foodborne-illnesses/norovirus/norwalk-prevention) Norovirus infection can be prevented through attention to proper sanitation and cooking procedures. The role of food handlers has been documented substantially, highlighting that keeping ill food handlers out of... ##### Outbreak Database #### Looking for a comprehensive list of outbreaks? The team at Marler Clark is here to answer all your questions. Find out if you’re eligible for a lawsuit, what questions to ask your doctor, and more. [ View Outbreak Database ](https://outbreakdatabase.com)