The World Health Organization urged China to deepen its investigation of a deadly strain of bird flu virus in pigs after Chinese officials disclosed they had uncovered the H5N1 virus in pigs as early as 2003, long before this year's flu outbreak, which killed 27. The agency said more lab experiments were needed to assess the extent to which infection among pigs can set off virus mutations that could attack humans. It said test results would help national and international public health authorities assess the risks of pig raising, and plan appropriate intervention.
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