# Update: Genetic Sequencing Results for Wisconsin Dairy Herd Detection of Highly Pathogenic Avian Influenza | APHIS

> USDA APHIS confirmed an H5N1 clade 2.3.4.4b D1.1 detection in a Wisconsin dairy herd, announced on 14 December 2025. Sequencing indicates a new, separate spillover from wildlife, and no additional herds have been linked to it so far. USDA states the detection does not affect the safety of the commercial milk supply.

- Date: 2025-12-19 · published 2025-12-19T12:00:00.000Z
- Category: disease · region US · magnitude low
- Page: https://feedsoft.ai/events/15946-update-genetic-sequencing-results-for-wisconsin-dairy-herd-detection-of-highly
- Commodities: [Milk (Class III)](https://feedsoft.ai/c/MILK.md)

## Why it matters

Because milk from affected herds is diverted and pasteurization inactivates the virus, the price effect on milk and dairy feed demand should be limited. Further herd spread would be the main risk to dairy output.

## Read by commodity

- MILK: neutral

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| MILK | 2024-10-30 | [Protect Livestock and Public Health from H5N1 Avian Influenza \| APHIS](https://feedsoft.ai/events/16051-protect-livestock-and-public-health-from-h5n1-avian-influenza-aphis.md) | -12.3% | -12.6% |
| MILK | 2024-04-28 | [Influenza A (H5N1) of avian origin in domestic livestock in the USA - GOV.UK](https://feedsoft.ai/events/16098-influenza-a-h5n1-of-avian-origin-in-domestic-livestock-in-the-usa-gov-uk.md) | +18.6% | +19.7% |
| MILK | 2026-03-20 | [Why We Must Vaccinate US Dairy Cattle Against HPAI H5N1 \| The Journal of Infectious Diseases \| Oxford Academic](https://feedsoft.ai/events/15928-why-we-must-vaccinate-us-dairy-cattle-against-hpai-h5n1-the-journal-of.md) | +0.1% | +4.5% |
| MILK | 2025-07-23 | [Current Situation: Bird Flu in Dairy Cows \| Bird Flu \| CDC](https://feedsoft.ai/events/15983-current-situation-bird-flu-in-dairy-cows-bird-flu-cdc.md) | -0.6% | +0.1% |
| MILK | 2024-04-03 | [Bird flu hits Texas dairy cows, hens, human as ducks migrate](https://feedsoft.ai/events/16103-bird-flu-hits-texas-dairy-cows-hens-human-as-ducks-migrate.md) | -4.7% | -5.0% |

## Sources

- aphis.usda.gov: https://www.aphis.usda.gov/news/agency-announcements/update-genetic-sequencing-results-wisconsin-dairy-herd-detection-highly

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Data from Feedsoft AI (https://feedsoft.ai/). For information only; not investment advice.