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Mexico Confirms First Screwworm Case in Tamaulipas, Triggering Rapid Containment Near U.S. Border

The Llera detection puts Mexico’s containment strategy under scrutiny during efforts to restart U.S.-bound cattle exports.

Overview

  • Mexico’s agriculture agency and the U.S. Department of Agriculture confirmed a Tamaulipas case in a six-day-old calf with an umbilical lesion in Llera, marking Mexico’s most northerly active infection to date.
  • Senasica deployed specialized teams, conducted epidemiological tracing, inspected 10 nearby production units and 325 animals across species with no additional positives, and reinforced trapping that so far has not captured GBG flies.
  • Authorities are coordinating with APHIS-USDA to release sterile flies in the region, complementing dispersal infrastructure inaugurated in Tamaulipas in late 2025 to suppress the pest’s reproduction.
  • Market analysts at GCMA warn the Tamaulipas finding could slow expectations for the U.S. to resume imports of live Mexican cattle, a trade already constrained by ongoing restrictions.
  • Senasica reports hundreds of active cases across 13 states as of late December, and with the Tamaulipas event detections now span 14 states, as Mexico expands sterile-fly capacity with a Metapa plant planned to start in the first half of 2026.