Norwalk and Norwalk-like viruses have been associated with outbreaks on cruise ships, in communities, camps, schools, institutions and families. Foods such as raw oysters, cake frosting and salads, as well as drinking water, have been implicated as a common source of viral infection in several outbreaks. A mild and brief illness usually develops 24 to 48 hours after contaminated food or water is consumed and lasts for 24 to 60 hours. Norwalk virus infection symptoms include nausea, vomiting, diarrhea and abdominal cramps. Symptoms experienced less often include headache, fever, chills and muscle pain.
Fluid replacement is the common therapy.
If You Eat Raw Oysters, You Need to Know July 1995. Bad Bug Book . National Food Safety Database. Consumer Tips for Handling Seafood Safely. Prepared by Robert J. Price, August 1990.