Aggressive Flu Strain Arrives Early And Spreads Rapidly Through U.S.

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A woman walks out of the Premier Care walk-in health clinic which... News PhotoAdult,Health Club,Healthcare And Medicine,Horizontal,Illness,New York City,USA,Walking,WomenPhotographer Collection: Getty Images News 2013 Getty ImagesNEW YORK, NY - JANUARY 10: A woman walks out of the Premier Care walk-in health clinic which administers flu shots on January 10, 2013 in New York City. The Flu season has hit parts of the country particularly hard this year with Boston declaring a public health emergency and a Pennsylvania hospital constructing a tent to handle excess flu cases.According to the Centers for Disease Control and Prevention 22,048 flu cases have been reported from September 30 through the end of 2012. (Photo by Spencer Platt/Getty Images)