Swine flu virus hasn't mutated, official says - Swine flu- msnbc.com
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Swine flu virus hasn't mutated, official says - Swine flu- msnbc.com
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.
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Tags: Vaccination, Flu, H1N1, Vaccine
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