New World screwworm confirmed in South Texas

Source:Wired

02 — Who / Subject

US Department of Agriculture (USDA)

03 — Where / Locus

Zavala County, Texas, USA

04 — When / Temporality

June 4, 2026

Verified: June 4, 2026

05 — Why / Core Summary

"The USDA confirmed a case of New World screwworm in a three-week-old calf in Zavala County, Texas. The parasite, which was eradicated in the US in the 1960s, poses a significant threat to livestock. A unified Incident Command Team has been established, and quarantine zones and sterile fly releases are being implemented."

Conflict Analysis

The re-emergence of this parasite in the US after decades of eradication is a major biosecurity concern for the livestock industry, potentially causing significant economic losses.

Recommended Background Resource

Affiliate / AdAI Curation

The Screwworm Problem: Evolution of Resistance to Sterile-Male Plantings

Author: Raymond C. Bushland

This book provides a foundational understanding of the Sterile Insect Technique (SIT), which is the primary method currently being deployed in Texas to combat the screwworm, written by one of the pioneers of the eradication program.

Explore Background Book (Amazon)

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