# Deadly Screwworm Spreads Fast With Milder Weather Fueling Resurgence

> New World screwworm cases are resurging in the US, with more than 40 confirmed in November, already the worst month since the pest first appeared in Texas. The parasite has spread to Arizona and there are nearly 130 US cases in total, with more than 60 active. Milder temperatures and humidity are favoring the parasite's activity.

- Date: 2026-11-12 · published 2026-11-12T18:13:48.435Z
- Category: disease · region US · magnitude medium
- Page: https://feedsoft.ai/events/95904-deadly-screwworm-spreads-fast-with-milder-weather-fueling-resurgence
- Commodities: [Live Cattle](https://feedsoft.ai/c/LCATTLE.md), [Feeder Cattle](https://feedsoft.ai/c/FCATTLE.md)

## Why it matters

Screwworm losses and movement restrictions reduce the available US cattle supply and raise the risk of further tightening, which supports cattle prices and raises feed demand from herds that are kept longer.

## Read by commodity

- FCATTLE: bullish ▲
- LCATTLE: bullish ▲

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| LCATTLE | 2026-05-29 | [Flesh-eating screwworm found within 31 miles of US border, says USDA \| Reuters](https://feedsoft.ai/events/19199-flesh-eating-screwworm-found-within-31-miles-of-us-border-says-usda-reuters.md) | -0.8% | +1.4% |
| LCATTLE | 2024-06-20 | [Mexico reinforces health surveillance against screwworm threat](https://feedsoft.ai/events/29682-mexico-reinforces-health-surveillance-against-screwworm-threat.md) | +2.3% | -0.8% |
| 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% |
| LCATTLE | 2025-04-28 | [Rollins to Mexico: Fight Screwworm Harder or Face New Trade Restrictions](https://feedsoft.ai/events/25083-rollins-to-mexico-fight-screwworm-harder-or-face-new-trade-restrictions.md) | +0.4% | +3.8% |
| LCATTLE | 2026-06-05 | [Cattle futures rally on first US screwworm detection - CME
						 \| The Cattle Site](https://feedsoft.ai/events/12089-cattle-futures-rally-on-first-us-screwworm-detection-cme-the-cattle-site.md) | +0.4% | -2.4% |
| FCATTLE | 2026-05-29 | [Flesh-eating screwworm found within 31 miles of US border, says USDA \| Reuters](https://feedsoft.ai/events/19199-flesh-eating-screwworm-found-within-31-miles-of-us-border-says-usda-reuters.md) | +0.1% | +4.8% |
| FCATTLE | 2024-06-20 | [Mexico reinforces health surveillance against screwworm threat](https://feedsoft.ai/events/29682-mexico-reinforces-health-surveillance-against-screwworm-threat.md) | +0.7% | -1.4% |
| FCATTLE | 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) | -2.4% | -7.8% |

## Sources

- insurancejournal.com: https://www.insurancejournal.com/news/southcentral/2026/11/12/892449.htm

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