# Cattle screwworm outbreak in Chihuahua

> Live situation record from CLSTR: https://clstr.news/situations/cattle-screwworm-outbreak-in-chihuahua
> Updated: 2026-08-12T13:50:00.000Z. Sources: 8. Developments: 2.

To address the cattle screwworm (Gusano Barrenador del Ganado) outbreak in Chihuahua, authorities have implemented a series of containment and coordination measures.

Initially, the Secretariat of Rural Development (SDR) and Senasica introduced a protocol to allow the movement of cattle, horses, sheep, and goats from affected municipalities to clean zones. This protocol requires animals to be treated with the antiparasitic drug Doramectin, followed by a 72-hour waiting period before transport is permitted. The goal is to maintain livestock production while preventing the pest from spreading.

Following these measures, the Chihuahua State Government established the State Animal Health Emergency Group (GEESA). This organization coordinates response efforts between state and federal authorities, security institutions, academic bodies, and livestock producers. GEESA includes specialized units for epidemiological surveillance, quarantine, biosecurity, and immunization, utilizing standardized protocols and unified data to track and investigate cases.

## Claims

- The Chihuahua State Government formed the State Animal Health Emergency Group (GEESA). (corroborated by 3 sources)
- GEESA aims to coordinate and improve response capacity regarding the cattle screwworm (GBG) zoosanitary emergency. (corroborated by 3 sources)
- Secretary of Rural Development Mauro Parada Muñoz stated that joint work is essential to address the contingency. (corroborated by 3 sources)
- GEESA President Mario Guevara Acosta provided training on prevention, surveillance, and control measures for GBG. (corroborated by 3 sources)
- The GEESA structure includes units for epidemiological surveillance, quarantine, focus inactivation, biosecurity, and immunization. (corroborated by 3 sources)

## Timeline

### 2026-08-12: Chihuahua forms animal health emergency group to combat cattle screwworm

Chihuahua has formed the State Animal Health Emergency Group (GEESA) to coordinate the response to the cattle screwworm (GBG) zoosanitary emergency through multi-agency cooperation.

6 sources. https://clstr.news/cluster/chihuahua-forms-animal-health-emergency-group-to-combat-cattle-screwworm

### 2026-08-05: Chihuahua implements safe livestock movement protocol to curb cattle worm

SDR and Senasica in Chihuahua require Doramectin treatment and a 72‑hour wait before moving livestock from cattle‑worm‑affected zones to clean areas, aiming to sustain production and block spread.

2 sources. https://clstr.news/cluster/chihuahua-implements-safe-livestock-movement-protocol-to-curb-cattle-worm

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Cite as: Cattle screwworm outbreak in Chihuahua. CLSTR, https://clstr.news/situations/cattle-screwworm-outbreak-in-chihuahua