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  • Older Adults May Be Immune to H1N1

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Older Adults May Be Immune to H1N1

The CDC says people who were exposed to the flu in 1957 may have some immunity to the current H1N1 flu virus. It may explain why this year's strain has mainly affected younger people.

NBC Digital Health | June 4, 2009Watch more videos from NBC Digital Health

Tags:. .strain. .immunity. .immune. .cdc. .flu











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