Controversial bird flu research to resume

Bird flu researchers end a yearlong moratorium on experiments to determine whether the H5N1 virus can mutate and spread among humans. The work, which was deemed risky, won't resume yet in the U.S.Bird flu researchers said Wednesday that they would end a self-imposed moratorium on controversial experiments to determine how the deadly H5N1 virus might mutate and gain the ability to spread easily among humans.

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