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Avian flu has infected dairy cows in more than a dozen states – a microbiologist explains how the virus is spreading

  • Written by Jenna Guthmiller, Assistant Professor of Immunology and Microbiology, University of Colorado Anschutz Medical Campus
Avian flu has infected dairy cows in more than a dozen states – a microbiologist explains how the virus is spreadingAlthough H5N1 typically infects wild birds, the virus has spilled over into domesticated animal populations, like dairy cows.Peter Cade/Stone via Getty Images

The current strain of avian flu, H5N1, is responsible for the culling of millions of domestic birds and has sickened more than a dozen farmworkers in 2024, most recently in Colorado.

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