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Bird flu virus raises questions scientists working to answer
Bird flu virus raises questions scientists working to answer
Bird flu virus raises questions scientists working to answer
DES MOINES, Iowa (AP) -- It's been five months since the H5N2 bird flu virus was discovered in the United States, and producers have lost 21 million birds in the Midwest alone. Yet, researchers acknowledge they still know little about a bird flu virus that's endangered turkey and egg-laying chicken populations that supply much of the nation.

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