Brock N, Pulit-Penaloza JA, Belser JA, Pappas C, S. Avian Influenza A(H5N1) Isolated from Dairy Farm Worker, Michigan. Emerg Infect Dis. 2025 June
Influenza A(H5N1) viruses have been detected in US dairy cow herds since 2024. We assessed the pathogenesis, transmission, and airborne release of A/Michigan/90/2024, an H5N1 isolate from a dairy farm worker in Michigan, in the ferret model. Results show this virus caused airborne transmission with moderate pathogenicity, including limited extrapulmonary spread, without lethality.
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