# Bird flu virus has been spreading among US cows for months, RNA reveals | Nature

> Nature reports that genetic (RNA) evidence shows H5N1 bird flu has been circulating among US dairy cows for months. The findings suggest the outbreak in cattle went undetected for longer than previously recognised. The report focuses on the virus's spread within herds.

- Date: 2024-04-27 · published 2024-04-27T12:00:00.000Z
- Category: disease · region US · magnitude medium
- Page: https://feedsoft.ai/events/16100-bird-flu-virus-has-been-spreading-among-us-cows-for-months-rna-reveals-nature
- Commodities: [Milk (Class III)](https://feedsoft.ai/c/MILK.md)

## Why it matters

Longer undetected spread in dairy herds raises the likelihood of ongoing milk production losses and tighter surveillance. This is a disease development with limited direct effect on feed prices.

## Read by commodity

- MILK: neutral

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| 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% |
| MILK | 2024-04-03 | [Bird flu outbreak in the US. What to know \| AP News](https://feedsoft.ai/events/16104-bird-flu-outbreak-in-the-us-what-to-know-ap-news.md) | -4.7% | -5.0% |
| MILK | 2024-08-23 | [How scientists are working to solve the bird flu outbreak \| AP News](https://feedsoft.ai/events/16071-how-scientists-are-working-to-solve-the-bird-flu-outbreak-ap-news.md) | -0.3% | +12.9% |
| 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 | 2024-07-10 | [Bird flu response in Michigan sparks COVID-era worry on farms \| Reuters](https://feedsoft.ai/events/29269-bird-flu-response-in-michigan-sparks-covid-era-worry-on-farms-reuters.md) | -0.1% | +2.6% |

## Sources

- nature.com: https://www.nature.com/articles/d41586-024-01256-5

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