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10: Swineflu
The 2009 outbreak of influenza (H1N1) virus or "swine flu" is an epidemic of a new type of influenza virus identified in April 2009. It's caused by a new swine flu virus that has changed in ways that allow it to spread from person to person and it's happening among people who haven't had any contact with pigs. The U.N.'s World Health Organization (WHO) expressed concern that the (H1N1) could become a worldwide flu pandemic. Symptoms of swine flu are like regular flu symptoms and include fever, cough, sore throat, runny nose, body aches, headache, chills, and tiredness