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Screwworm Resurgence Halts Mexican Cattle Exports, Inflicting $30M Monthly Losses

Authorities plan to complete binational sterile fly facilities by mid-2026, deploying them to eradicate screwworm—an essential step toward reopening exports.

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Trabajadores arrean ganado en una hacienda que lo exporta a Estados Unidos, el martes 29 de julio de 2025, en Zamora, en el norte de México. (AP Foto/Fernando Llano)
Veterinarios examinan animales en un rancho que suministra ganado para exportación a EEUU, en Zamora, México, el lunes 28 de julio de 2025, mientras la frontera estadounidense permanece cerrada a las importaciones de ganado mexicano debido a preocupaciones por el gusano barrenador. (AP Foto/Fernando Llano)

Overview

  • The U.S. border remains closed to Mexican live cattle after a new screwworm outbreak in Veracruz, cutting exports by half and costing producers $25–30 million each month.
  • Annual containment measures to detect and quarantine infected animals have surged to $400 million, raising inspection costs by about 1,600 pesos per head.
  • Mexico and the USDA are jointly investing $51 million in two sterile fly facilities expected to produce 100 million flies weekly by mid-2026.
  • Faced with prolonged export suspensions, Sonora ranchers have diversified into apiculture, sheep rearing, dairy operations, and upscale butcher shops.
  • A severe northern drought has further depleted herds and driven up feed prices, intensifying financial pressure on the livestock industry.