When is norovirus infectious

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Mayo Clinic is a nonprofit organization and proceeds from Web advertising help support our mission. Norovirus is the leading cause of foodborne illness outbreaks in Minnesota.

Norovirus is not related to the flu influenza , which is a common respiratory illness caused by the influenza virus.

Common symptoms of norovirus infection include vomiting, diarrhea, and stomach cramping. Less common symptoms can include low-grade fever or chills, headache, and muscle aches. Symptoms usually begin 1 or 2 days after ingesting the virus, but may appear as early as 12 hours after exposure. The illness typically comes on suddenly. The infected person may feel very sick and vomit often, sometimes without warning, many times a day.

Sometimes people infected with norovirus have no symptoms at all, but can still pass the virus to others. Most people recover in 1 or 2 days and have no long-term health effects. Accessed Nov. Blacklow NR.

Epidemiology of viral gastroenteritis in adults. Longo DL, et al. Viral gastroenteritis. In: Harrison's Principles of Internal Medicine.

New York, N. Rochester, Minn. Alexandraki I, et al. Acute viral gastroenteritis in adults. Norovirus: Technical fact sheet. Prevent Norovirus. Protect yourself and others from norovirus: Wash your hands often Rinse fruits and vegetables Cook shellfish thoroughly Stay home when sick and for two days after symptoms stop Avoid preparing food for others when sick and for two days after symptoms stop.

Trends and Outbreaks. Outbreaks are common The virus spreads very easily and quickly Norovirus spreads: From infected people to others Through contaminated foods and surfaces Outbreaks can happen anytime, but they occur most often from November to April. Sending a child to youth camp? Stomach bug or norovirus?