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USDA Animal and Plant Health Inspection Service

Federal Agricultural Agency

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Bird flu jumps to mammals

Force in Play

Tracking infected herds, coordinating depopulation

A bird virus jumped the species barrier. In March 2024, H5N1 avian influenza appeared in U.S. dairy cattle for the first time in historyโ€”an unexpected leap that's infected over 1,000 herds across 17 states and 70 humans. One person has died. When New York inspectors found the virus in seven live poultry markets in Queens, the Bronx, and Brooklyn on February 7, 2025, Governor Kathy Hochul shuttered all 82 markets across the city and surrounding counties for emergency disinfection.

Updated Jan 7