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Understanding Flu

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H1N1 Influenza (Swine Flu)

NIAID Science Updates on Influenza Research

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Community Immunity (Herd Immunity)

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Learn how immunizing a critical portion of a community protects most members of the community.

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External Resources

View a list of links for more information about influenza.

CDC, in coordination with its Advisory Committee for Immunization Practices, has additional recommendations for influenza vaccine use.

Flu (Influenza)

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Last Updated September 24, 2008

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