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exp Cohen and swine flu cases in pigs_00001123

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    Swine flu cases appear in four states

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Swine flu cases appear in four states

A new strain of swine flu is in pigs in four states, according to the CDC. CNN's Elizabeth Cohen has more.

Swine flu cases appear in four states

A new strain of swine flu is in pigs in four states, according to the CDC. CNN's Elizabeth Cohen has more.