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Environment
Jun 25, 2026
Analyzed by Glm 4.7 Flash

The Return of the Screwworm: A 60-Year Setback for US Agriculture

AI Summary
The New World screwworm, previously eradicated in the US since 1966, has re-emerged in a Texas calf, originating from Central America. This event threatens the livestock industry, poses health risks to humans, and could trigger significant economic losses and beef price inflation.

The Re-Emergence of a Decade-Old Threat

The US Department of Agriculture confirmed on Wednesday the first detection of the New World screwworm in a calf in Texas since the pest was declared eradicated in 1966. This flesh-eating parasite, believed to have migrated from Central America via Mexico, has breached biological barriers that have kept it at bay for decades.

  • Between mid-July and mid-August 2025, Mexico reported a 53 percent surge in cases.
  • Human infections have also been confirmed, primarily in Mexico's Chiapas state.

Economic Fallout and Supply Chain Disruptions

The economic implications are severe. The USDA predicts a potential loss of $1.8bn to the Texas economy if the outbreak spreads unchecked. Furthermore, the US has halted cattle imports from Mexico for over a year, contributing to a tightening supply chain that has already driven beef prices to record highs.

Beyond Cattle: Public Health and Industry Vulnerability

While livestock are the primary target, the threat extends to humans. The larvae burrow into living tissue, causing painful, foul-smelling wounds. Experts warn that homeless populations are particularly vulnerable due to lack of hygiene access. Additionally, the decades-long absence of the pest means many modern ranchers lack the experience to diagnose and treat it effectively.

The Road to Eradication: A Costly Battle Ahead

Authorities have established a 20km quarantine zone around the infected farm in LaPryor, Texas. The primary containment strategy involves identifying cases, isolating livestock, and releasing sterile male flies to disrupt reproduction. However, experts warn that without aggressive intervention, the US could face a resurgence of a pest that once devastated the American agricultural landscape.