LOS ANGELES, April 7 (Xinhua) -- A highly pathogenic avian flu virus is spreading across U.S. farms and chicken yards, sprawling to at least 24 states in the country less than two months after the first outbreak was reported in a commercial flock.
More than 22.8 million birds have been affected and had to be put to death in the past two months because of the influenza Type A virus, known as influenza A, according to data of the U.S. Department of Agriculture.
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