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More than 1 in 5 infected with H1N1 virus worldwide during 2009-10 flu season

More than a fifth of the world’s population was infected by the H1N1 virus in the 2009-2010 flu pandemic, according to new estimates released on Friday. The study confirms warnings that so-called swine flu was highly contagious. It also estimates that the flu’s lethality — as previously reported — was…