# New World Screwworm Found in Arizona as USDA Reopens Border Trade

> New World screwworm cases in the U.S. rose to 71, with 18 active, after a first case was confirmed in Arizona in a dog on Oct. 28. USDA has continued the phased reopening of Mexico-U.S. ports for cattle, with the Douglas, Arizona port opening Aug. 24, 2026.

- Date: 2026-11-02 · published 2026-11-03T09:15:00.606Z
- Category: disease · region US · magnitude medium
- Page: https://feedsoft.ai/events/77461-new-world-screwworm-found-in-arizona-as-usda-reopens-border-trade
- Commodities: [Feeder Cattle](https://feedsoft.ai/c/FCATTLE.md)

## Why it matters

Reopened border ports add Mexican feeder cattle supply, which is bearish for feeder cattle prices. Spreading screwworm cases raise the risk of new movement restrictions, which could reverse that pressure.

## Read by commodity

- FCATTLE: bearish ▼

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| FCATTLE | 2025-01-28 | [USDA’s APHIS and Mexico Getting Closer to Reopening the Border for Feeder Cattle With Updated Screwworm Protocols - Oklahoma Farm Report](https://feedsoft.ai/events/26446-usda-s-aphis-and-mexico-getting-closer-to-reopening-the-border-for-feeder.md) | -3.3% | -2.0% |
| FCATTLE | 2025-04-30 | [United States and Mexico Reach Agreement to Resume Eradication Efforts on New World Screwworm](https://feedsoft.ai/events/25078-united-states-and-mexico-reach-agreement-to-resume-eradication-efforts-on-new.md) | +0.6% | +0.5% |
| FCATTLE | 2025-10-23 | [Mexican ag minister to discuss with US counterpart opening border to cattle amid screwworm outbreak \| Reuters](https://feedsoft.ai/events/22362-mexican-ag-minister-to-discuss-with-us-counterpart-opening-border-to-cattle.md) | -4.7% | -6.4% |
| FCATTLE | 2018-01-01 | [Canada Blocks Texas Cattle as Flesh-Eating Screwworm Returns to the US After 60 Years](https://feedsoft.ai/events/66963-canada-blocks-texas-cattle-as-flesh-eating-screwworm-returns-to-the-us-after-60.md) | +0.3% | +0.8% |
| FCATTLE | 2026-03-31 | [USDA Eyes Phased Reopening of Southern Border to Mexican Feeder Cattle - RFD](https://feedsoft.ai/events/20115-usda-eyes-phased-reopening-of-southern-border-to-mexican-feeder-cattle-rfd.md) | +1.5% | +2.4% |

## Sources

- dtnpf.com: https://www.dtnpf.com/agriculture/web/ag/livestock/article/2026/11/02/new-world-screwworm-found-arizona

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