Overview
- SADER and SENASICA confirmed a screwworm detection in a Montemorelos shipment from the south-southeast, where larvae were found dead or moribund after mandatory ivermectin and larvicide treatment.
- Authorities activated incursion protocols for free zones, treated and inspected all 85 cattle in the lot, found no additional positives, and notified APHIS-USDA.
- The earlier Sabinas Hidalgo detection near the U.S. border was declared inactive on October 5 following sanitary sweeps, trapping, and sterile-fly releases.
- USDA Secretary Brooke Rollins said the Nuevo León finding appears isolated and announced personnel will be sent to expand verification, trapping, surveillance, and sterile-fly releases in the area.
- The outbreak remains concentrated in the south, with Yucatán reporting 658 cases across 77 municipalities and SENASICA counting 6,703 confirmed animal cases through mid‑September, while a consultant report cites 7,885 cumulative cases as of October 4 and notes a temporary suspension of live-cattle exports to the U.S.