Bird flu likely circulated in US cows for four months before diagnosis -paper

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Bird flu likely circulated in U.S. dairy cows on a limited basis for about four months before federal officials confirmed the disease that has now spread to nine states, according to a new federally funded research paper. The U.S. Department of Agriculture reported the first-ever H5N1 virus infection in a dairy cow in Texas on March 25, following reports of decreased milk yields in multiple states. The USDA has said it believes wild birds, which can carry the virus, introduced H5N1 to cattle.