# Flesh-eating screwworm confirmed in Texas calf as parasite crosses border from Mexico | Reuters

> The USDA confirmed a New World screwworm case in a calf in La Pryor, Texas, about 30 miles from the US-Mexico border. It is the first domestic case in decades, and the USDA has activated personnel on the ground.

- Date: 2026-06-03 · published 2026-06-03T12:00:00.000Z
- Category: disease · region US · magnitude high
- Page: https://feedsoft.ai/events/18763-flesh-eating-screwworm-confirmed-in-texas-calf-as-parasite-crosses-border-from
- Commodities: [Feeder Cattle](https://feedsoft.ai/c/FCATTLE.md), [Live Cattle](https://feedsoft.ai/c/LCATTLE.md)

## Why it matters

A confirmed US outbreak threatens the national herd and could restrict cattle movement, tightening supplies and lifting feeder and live cattle prices. Cattle futures rallied sharply on the news.

## Read by commodity

- FCATTLE: bullish ▲
- LCATTLE: bullish ▲

## Linked price moves

| Commodity | Date | Window | Change % | z-score | Why linked |
| --- | --- | --- | --- | --- | --- |
| FCATTLE | 2026-06-03 | 1 | +3.1% | 3.3 | USDA confirmation of the first US New World screwworm case in a Texas calf (reported 2026-06-03) is the key supply-shock/sentiment catalyst that drove the sharp feeder cattle rally. |

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| FCATTLE | 2025-07-10 | [US again halts cattle imports from Mexico over flesh-eating screwworms \| Reuters](https://feedsoft.ai/events/23700-us-again-halts-cattle-imports-from-mexico-over-flesh-eating-screwworms-reuters.md) | +1.6% | +7.7% |
| FCATTLE | 2025-10-01 | [Mexico sees 32% jump in flesh-eating screwworm cases since August as cases move north \| Reuters](https://feedsoft.ai/events/22368-mexico-sees-32-jump-in-flesh-eating-screwworm-cases-since-august-as-cases-move.md) | +1.2% | -4.7% |
| FCATTLE | 2025-07-10 | [US recloses border with Mexico as flesh-eating parasite moves north \| AP News](https://feedsoft.ai/events/23705-us-recloses-border-with-mexico-as-flesh-eating-parasite-moves-north-ap-news.md) | +1.6% | +7.7% |
| FCATTLE | 2026-06-05 | [US races to contain flesh-eating parasite screwworm, reports no further cases](https://feedsoft.ai/events/18948-us-races-to-contain-flesh-eating-parasite-screwworm-reports-no-further-cases.md) | +1.8% | +2.0% |
| FCATTLE | 2026-01-01 | [Flesh-eating worm in Mexico is upending cross-border cattle trade](https://feedsoft.ai/events/21453-flesh-eating-worm-in-mexico-is-upending-cross-border-cattle-trade.md) | +3.5% | +2.9% |
| LCATTLE | 2025-07-10 | [US again halts cattle imports from Mexico over flesh-eating screwworms \| Reuters](https://feedsoft.ai/events/23700-us-again-halts-cattle-imports-from-mexico-over-flesh-eating-screwworms-reuters.md) | +2.6% | +6.8% |
| LCATTLE | 2025-10-01 | [Mexico sees 32% jump in flesh-eating screwworm cases since August as cases move north \| Reuters](https://feedsoft.ai/events/22368-mexico-sees-32-jump-in-flesh-eating-screwworm-cases-since-august-as-cases-move.md) | -0.1% | +0.2% |
| LCATTLE | 2025-08-15 | [In Texas cattle country, ranchers brace for flesh-eating screwworms \| Reuters](https://feedsoft.ai/events/23280-in-texas-cattle-country-ranchers-brace-for-flesh-eating-screwworms-reuters.md) | +1.1% | -0.1% |

## Sources

- reuters.com: https://www.reuters.com/business/healthcare-pharmaceuticals/unconfirmed-us-case-flesh-eating-screwworm-rattles-cattle-markets-traders-say-2026-06-03/

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