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Written by the OrganizedWisdom Team with as the reviewer. All original content is supervised by the The OrganizedWisdom Medical Review Team

washingtonpost.com

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HONG KONG (AP) -- The swine flu virus hasn't mutated into a more deadly strain but there are early signs it is developing resistance to vaccine, the World Heath Organization's chief said Monday.

« Back to the What Mutation Is 2009 Swine Flu WisdomCard

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