Abstract
Since March 2024, HPAI H5N1 virus has infected dairy cattle in the U.S., 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, questions remain about semen-associated transmission risks and biosecurity practices.
Competing Interest Statement
The authors have declared no competing interest.
Source: BioRxIV, https://www.biorxiv.org/content/10.1101/2025.10.16.682947v1
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