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WEKU
WEKU
Bill Chappell

What we know about the deadliest U.S. bird flu outbreak in history

Rescued chickens gather in an aviary at Farm Sanctuary's Southern California Sanctuary on Oct. 5 in Acton, Calif. A wave of the highly pathogenic H5N1 avian flu has entered Southern California, driven by wild bird migration. (Mario Tama/Getty Images)

The U.S. is enduring an unprecedented poultry health disaster, with a highly contagious bird flu virus triggering the deaths of some 52.7 million animals.

The culprit is highly pathogenic avian influenza, or HPAI. It has ravaged farm flocks and chicken yards in 46 states since February, when the first cases were reported in commercial flocks.

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