Sydney: A new strain of norovirus that could cause a severe epidemic of acute gastroenteritis this winter has surfaced, warn researchers.Known as Sydney 2012, the highly infectious mutant virus has already caused an epidemic of nausea, vomiting and diarrhoea in Europe, with an estimated 1.2 million cases of gastro in the Britain during the colder months.It has led to the closure of dozens of hospital wards in Britain and affected schools, age-care facilities, cruise ships and workplaces.Norovirus are a group of viruses that cause food-poisoning and acute gastroenteritis (stomach flu) that can make a person feel very sick but which typically resolves within two to three days.Pandemic norovirus strains have emerged around the world five times, in 1996-97, 2002, 2004, 2006 and 2009.
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