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The flu: Why do some live and others die?

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Bird flu test
The Minnesota DNR and the USDA are testing ducks for the H5N1 virus as part of a national bird flu surveillance.
MPR Photo/Dan Gunderson
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Bird flu test
The Minnesota DNR and the USDA are testing ducks for the H5N1 virus as part of a national bird flu surveillance.
MPR Photo/Dan Gunderson