--- title: Common Places Norovirus Outbreaks Tend to Occur date: 2022-04-14T18:09:00-07:00 author: Bill Marler canonical_url: "https://marlerclark.com/news_events/common-places-norovirus-outbreaks-tend-to-occur" section: News --- [All News](/news_events) / [Outbreaks](https://marlerclark.com/news_events/outbreaks) / # Common Places Norovirus Outbreaks Tend to Occur The Centers for Disease Control and Prevention (CDC) estimates that noroviruses cause nearly 21 million cases of acute gastroenteritis annually, making noroviruses the leading cause of gastroenteritis in adults in the United States. Humans are the only host of norovirus, and norovirus has several mechanisms that allow it to spread quickly and easily. Norovirus causes nearly 60% of all foodborne illness outbreaks. Norovirus is transmitted primarily through the fecal-oral route, with fewer than 100 norovirus particles needed to cause infection. Infected individuals shed the virus in large numbers in their vomit and stool, shedding the highest number of viral particles while they are ill. Aerosolized vomit has also been implicated as a mode of norovirus transmission. When food is the vehicle of transmission, contamination occurs most often through a food handler improperly handling a food directly before it is eaten. Common settings for norovirus outbreaks include restaurants and events with catered meals, nursing homes, schools, vacation settings or cruise ships, Shellfish (oysters, clams, mussels) pose the greatest risk and any serving may be contaminated with norovirus. ### 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 Washington State](https://marlerclark.com/23-sickened-in-norovirus-outbreak-linked-to-habit-burger-grill-in-washington) [Arby's Norovirus Outbreak Sickens Nearly 100 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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)