15 Key Facts About Norovirus
- Norovirus is the most common cause of gastroenteritis in the U.S., causing between 19 – 21 million cases per year.
- Norovirus causes between 570 – 800 deaths per year, generally among the elderly and young children. 
- Norovirus is oftentimes called stomach bug, viral gastroenteritis, food poisoning, or stomach flu.
- The incubation period is 12 to 48 hours.
- It’s more common for children to vomit when they have the virus.
- It’s more common for adults to have diarrhea when they have the virus.
- Symptoms can include vomiting, stomach pain, diarrhea, and nausea.
- The duration of the illness lasts between 1 to 3 days, although for the young, old, or those with suppressed immune systems, it can last between 4 to 6 days.
- Once the virus reaches your stomach or intestines, it causes it to become inflamed. This inflammation is what causes you to vomit or have diarrhea.
- Vomiting and diarrhea can lead to dehydration.
- There are many strains of norovirus.
- Leafy greens like lettuce, shellfish, and fresh fruits are the most common foods associated with the outbreaks of the virus.
- About 400,000 young children visit the Emergency Room with norovirus each year.
- Cooking shellfish, such as oysters, helps reduce the chance of getting norovirus
- The first norovirus outbreak occurred in 1972 in Norwalk, Ohio.