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Norwalk virus,

highly contagious viral disease caused by infection with an RNA virus of the genus Norovirus. The virus causes acute gastroenteritis, usually one to two days after infection; typical symptoms are abdominal pain and cramps, diarrhea, vomiting, and a low-grade fever. Dehydration may result if enough liquids are not consumed to replace lost fluids. There is no treatment for norovirus, which usually lasts one to three days and does not result in severe illness, but it may become life-threatening if an infected person becomes dehydrated. Dehydration may be treated by administering fluids intravenously. A person typically remains contagious for several days after the acute illness has ended.

Norovirus is transmitted by the fecal-oral route, most commonly through person-to-person contact a result of poor hygiene or through food contaminated by an infected food preparer or handler. Ingestion of uncooked shellfish harvested from contaminated waters or of contaminated drinking water may also transmit the disease. Outbreaks most commonly occur in settings where individuals are in close quarters, such as hospitals, nursing homes, and retirement homes, vacation resorts and cruise ships, and child-care centers and schools, and spread rapidly; most epidemic viral gastroenteritis is caused by a Norovirus. The virus can persist in the environment on some surfaces for a relatively extended period of time, and is resistant to disinfection by alcohol- or detergent-based agents, but soap and water is effective in blocking the spread of the disease. The disease was first identified as result of an outbreak in a Norwalk, Ohio, elementary school in 1968.

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Molecular epidemiology of noroviruses associated with acute sporadic gastroenteritis in children: global distribution of genogroups, genotypes and GII.
Noroviruses are responsible for almost a fifth (18 per cent) of all cases worldwide.
The test identifies and distinguishes the GI and GII genogroups, which are two of the five noroviruses genogroups and account for most of human infections.
Noroviruses were concentrated from stool by suspending 1 g of stool in 7 mL phosphate buffered saline.
The Nevada State Health Division has released an updated toolkit on outbreak preparedness and response to noroviruses, the most commonly investigated health care-associated infection in the state.
Noroviruses, transmitted from person to person and indirectly via contaminated water and food, are highly contagious.
difficile and noroviruses, recent introduction of new strains with slight genetic changes that led to an improved capacity to cause disease and an immunologically naive (unexposed) population resulted in easier transmission, especially in group facilities, and a higher frequency of severe disease.
Noroviruses produce non-fatal but extremely unpleasant bouts of illness leading to violent repeated vomiting and diarrhoea.
According to the Centers for Disease Control and Prevention, noroviruses are a group of related viruses that cause acute gastroenteritis in humans.
Noroviruses are part of a group of viruses that are the most common cause of gastroenteritis (upset stomach) in the UK.
Noroviruses are a group of viruses that are the most common cause of gastroenteritis (stomach bugs) in England and Wales.
Until now, however, researchers hadn't tested the effectiveness of such sanitizers against noroviruses, a family of viruses that causes gastrointestinal infections and has become notorious for spreading among passengers on cruise ships.