Highly Pathogenic Avian Influenza A(H5N1) Virus RNA in Bovine Semen, California, USA, 2024
Emerging Infectious Diseases
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April 28 2026
Abstract:
"Since March 2024, highly pathogenic avian influenza (HPAI) A(H5N1) virus has infected dairy cattle in the United States, prompting concern about novel transmission routes. During an outbreak in California, HPAI H5N1 RNA was detected in an asymptomatic bull’s semen. Although infectious virus was not isolated, semen-associated transmission risks and biosecurity practices remain a concern."
Lim A, Poulsen K, Caserta LC, Guan L, Opgenorth E, Beal MP, et al. Highly pathogenic avian influenza A(H5N1) virus RNA in bovine semen, California, USA, 2024. Emerg Infect Dis. https://doi.org/10.3201/eid3205.251639
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