In southern Mexico, in the tropical plains of Metapa, engineers, veterinarians, and entomologists are racing against time to restart a strategic plant designed to produce sterile flies. Their mission: to stop the spread of the flystrike worm, a devastating parasite that seriously threatens the country's cattle herd.
The plant, scheduled to open in July 2026, will be at the heart of a vast plan to combat this infestation, which has been steadily advancing toward northern Mexico since August. The principle is simple but incredibly effective: produce and release millions of male flies rendered sterile in the laboratory. By mating with wild females, they prevent the parasite from reproducing, causing a gradual decline in its population.
The fly worm, known for attacking open wounds in livestock, causes significant economic losses in agricultural regions. It burrows into the flesh of animals to lay its eggs, leading to infections, weight loss, and sometimes death. The current outbreak has already led the United States to close its border to Mexican cattle, fearing a northward spread.
Washington has invested $21 million in the eradication program, demonstrating the importance of cross-border partnerships in containing this threat. Mexican authorities hope that the revival of this plant will replicate the success of the 1990s, when the sterile fly technique eliminated the parasite from much of Central America.
Beyond animal health, this project has major economic implications. Livestock farming is one of the pillars of Mexico's rural economy, and an uncontrolled infestation could seriously harm agricultural exports. By leveraging science and international cooperation, Mexico hopes not only to protect its livestock but also to restore the trust of its trading partners.
The war against the myiasis worm is far from won, but this new plant embodies the hope of a lasting victory against a biological scourge that, for decades, has silently eroded the foundations of Mexican agriculture.
