# Oregon logs its first H5N1 case in cows; farmers' union says human avian flu cases underreported in Washington

Source: [Biology News - Evolution, Cell theory, Gene theory, Microbiology, Biotechnology](https://phys.org/news/2026-11-oregon-h5n1-case-cows-farmers.html) · 2026-11-13 · Life
Page: https://themorning.science/story/oregon-logs-its-first-h5n1-case-in-cows-farmers-union-says-human-avian-flu-cases-ccae4f22f65ab66e
Kind: other · Impact: medium

## In brief

- USDA's Animal and Plant Health Inspection Service (APHIS) announced the first detection of H5N1 avian flu in a dairy herd in Oregon.
- The announcement came earlier in the week of the source article, which is dated 2026-11-13.
- A farmers' union says human avian flu cases are underreported in Washington.

## Why it matters

Detection of H5N1 in dairy cattle in a new state suggests the virus continues to spread through U.S. herds, which matters for animal health surveillance and for assessing risk to farm workers and the public.

## Coverage

- [Oregon logs its first H5N1 case in cows; farmers' union says human avian flu cases underreported in Washington](https://phys.org/news/2026-11-oregon-h5n1-case-cows-farmers.html) — Biology News - Evolution, Cell theory, Gene theory, Microbiology, Biotechnology, 2026-11-13

Tags: h5n1, avian flu, dairy cattle, animal health, oregon

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Brief generated by AI (claude-haiku-5-5) from the reporting listed under Coverage. Headlines belong to their publishers. The Morning Science – https://themorning.science