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Mexico’s Screwworm Outbreak Grows to 25 States as Tamaulipas Probes Suspected Human Cases

Officials say resistance to current treatments complicates control.

Overview

  • Government figures show 1,682 animals currently infected and 23,779 total cases since November 2024, with cattle the most affected.
  • The parasite, spread by a fly that lays eggs in open wounds, now spans 25 states with high counts in Oaxaca and Veracruz and cases in northern border states.
  • Mexico City recorded an isolated dog case in Tlalpan, and Jalisco authorities reported 11 infected dogs as veterinarians urge owners to keep pets’ wounds clean.
  • Tamaulipas has one confirmed human infection in El Mante and is investigating suspected cases in Ciudad Victoria and Reynosa while setting sanitary perimeters and stressing wound care.
  • An industry expert reported larvae resisting common drugs and urged larger sterile-fly releases and new medicines to strengthen the containment plan.