The number of dairy herd H5N1 outbreaks confirmed by the U.S. Department of Agriculture Animal and Plant Health Inspection Service stands at 140 from 12 states, of which 25 are from Michigan. Colorado, another state hit hard by H5N1 in dairy herds, has recently reported a few outbreaks in backyard birds, but has now reported its second-largest outbreak in commercial poultry since the virus emerged in U.S. birds in 2022.
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