The so-called Sydney 2012 strain has become the most common form of norovirus in circulation, scientists at the Health Protection Agency said.The virus, named after the place it first emerged, caused a similar early start to the norovirus season in Australia as has happened here.So far over 1.1m people have contracted nororvirus this winter in England as cases approached double the normal rate.http://www.telegraph.co.uk/health/healthnews/9790313/Norovirus-new-strain-may-be-to-blame-for-record-cases-say-experts.html
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