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2. H1N1 Influenza. New influenza virus that first caused illness in the US in April 2009.Spread mainly from person-to-person in droplets produced by coughs or sneezes of infected people.Symptoms are similar to those of the seasonal flu:Fever or chills AND cough or sore throatIn addition, other symptoms may include:Runny noseTirednessBody AchesDiarrheaHeadacheVomitingMost H1N1 cases have been reported as mild to moderate and most have recovered quickly and completely..
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