What are noroviruses? -- What are the symptoms of norovirus? -- How long do the symptoms normally last? -- How noroviruses are spread -- What to do if you get a norovirus -- Norovirus infections are not usually serious -- Where noroviruses are found -- Reasons why noroviruses are associated with cruise ships -- How to prevent getting and spreading noroviruses.

Noroviruses are a group of viruses (previously known as Norwalk-like viruses) that can affect the stomach and intestines. These viruses can cause people to have gastroenteritis, an inflammation of the stomach and the large intestines. Gastroenteritis is sometimes called a calicivirus infection or food poisoning, even though it may not always be related to food

Stephen B. Thacker CDC Library collection