# Screwworm Cases Surge in U.S. as Mild Weather Fuels Spread

> More than 40 New World screwworm cases were confirmed in the US in early November, the worst month since the parasite reached Texas in June, according to the USDA. Nearly 130 cases have been recorded nationwide, with more than 60 active, and the pest spread to Arizona in October. Over 65,000 cattle have crossed from Mexico since imports resumed in late August.

- Date: 2026-11-13 · published 2026-11-13T18:14:25.074Z
- Category: disease · region US · magnitude medium
- Page: https://feedsoft.ai/events/98164-screwworm-cases-surge-in-u-s-as-mild-weather-fuels-spread
- Commodities: [Live Cattle](https://feedsoft.ai/c/LCATTLE.md), [Feeder Cattle](https://feedsoft.ai/c/FCATTLE.md)

## Why it matters

Rising infestations raise the risk of movement restrictions and tighter US cattle supply, which supports live and feeder cattle prices. Mild weather is cited as the driver, so the outbreak could persist into winter.

## Read by commodity

- FCATTLE: bullish ▲
- LCATTLE: bullish ▲

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| LCATTLE | 2026-01-03 | [U.S. livestock: Cattle futures surge as second screwworm case announced \| The Western Producer](https://feedsoft.ai/events/21012-u-s-livestock-cattle-futures-surge-as-second-screwworm-case-announced-the.md) | +0.0% | +1.1% |
| LCATTLE | 2025-09-01 | [USDA ramps up screwworm fight as cattle futures surge](https://feedsoft.ai/events/23460-usda-ramps-up-screwworm-fight-as-cattle-futures-surge.md) | -1.4% | -3.5% |
| LCATTLE | 2026-05-01 | [More Screwworm Cases in Mexico Threaten Cattle Trade With US](https://feedsoft.ai/events/19652-more-screwworm-cases-in-mexico-threaten-cattle-trade-with-us.md) | +0.1% | +1.1% |
| LCATTLE | 2026-06-04 | [New World Screwworm Confirmed in US - CME Feeder Cattle Futures Surge After Early Slide](https://feedsoft.ai/events/12085-new-world-screwworm-confirmed-in-us-cme-feeder-cattle-futures-surge-after-early.md) | +0.6% | -1.0% |
| LCATTLE | 2026-06-25 | [The screwworm parasite continues to spread in Texas, threatening cattle and wildlife : NPR](https://feedsoft.ai/events/18767-the-screwworm-parasite-continues-to-spread-in-texas-threatening-cattle-and.md) | -2.9% | -10.1% |
| FCATTLE | 2026-01-03 | [U.S. livestock: Cattle futures surge as second screwworm case announced \| The Western Producer](https://feedsoft.ai/events/21012-u-s-livestock-cattle-futures-surge-as-second-screwworm-case-announced-the.md) | +1.3% | +2.9% |
| FCATTLE | 2025-09-01 | [USDA ramps up screwworm fight as cattle futures surge](https://feedsoft.ai/events/23460-usda-ramps-up-screwworm-fight-as-cattle-futures-surge.md) | -1.0% | -2.4% |
| FCATTLE | 2026-05-01 | [More Screwworm Cases in Mexico Threaten Cattle Trade With US](https://feedsoft.ai/events/19652-more-screwworm-cases-in-mexico-threaten-cattle-trade-with-us.md) | -2.0% | -6.8% |

## Sources

- businessbearings.com: https://businessbearings.com/articles/screwworm-cases-surge-past-40-as-mild-weather-aids-parasite

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