by Nell Greenfieldboyce
November 17, 2011
Scientists are worried about the deadly bird flu called H5N1 which sometimes infects people. It's never acquired the ability to transmit easily between humans, but researchers would like to know if that could happen. Recently, they've essentially been altering the genes of H5N1 to make the virus spread more easily between lab animals — raising concerns about biosafety and how this research is regulated.
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