Overview
- The state confirmed the first local case in Chihuahua after a producer reported larvae in an eight‑day‑old calf, and Mexican authorities sent samples for sequencing that were processed jointly with USDA technicians.
- Authorities established a focal sanitary zone of 20 kilometers and a perifocal zone of 40 kilometers around the affected ranch and began free on‑site treatments, inspections and traceability of nearby herds.
- Chihuahua now requires a certificate proving ivermectin application for any cattle moving into or out of the state and mandates physical inspection for animals sent to slaughter.
- The government is using sterile‑fly releases from the Metapa, Chiapas production plant as a biological control measure, but officials and producers say current output is not enough to cover the national outbreak immediately.
- The outbreak is already affecting trade and farms: U.S. border ports for Mexican live cattle remain closed, producers report heavy cost increases for treatments and inspections, and Zacatecas has confirmed human miasis cases that have raised public health alerts.