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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…

Concern grows over H1N1 outbreak in Bolivia

LA PAZ — An epidemic of H1N1 flu has infected almost 900 people and claimed 11 lives in Bolivia, health officials said Tuesday. Although most of the cases occurred in the last few weeks, the outbreak does not rise to the level of a national epidemic, officials said. “At the…