Lawmakers, USDA seek to combat New World screwworm along the southern border

The Hill

19-06-2025

Just a few hundred miles from our southern border, a flesh-eating parasite has been detected in Mexico, putting America's farmers and ranchers on watch. The New World screwworm is a parasitic fly that lays its eggs in the open wounds of livestock, primarily cattle and sheep, deer and other wildlife, and on rare occasions, humans and pets. Once hatched, the fly's larvae feed on tissue, leading to severe infection and often death. If this parasite were ever to reach the United States, our agricultural economy and supply chain would be in serious trouble.
That is not a hypothetical scenario. Flare-ups have occurred within our borders in the past, costing American producers hundreds of millions of dollars. Mrs. D., a Central Texas rancher, remembers all too well the devastation of the last major screwworm outbreak in the United States that took place during the 1960s. 'Every day from dawn to dusk, my husband would ride horseback to find animals affected by the screwworm. We worked tirelessly to ensure our livestock survived. We had to make sure our calves were born in the winter to stand a chance against the fly that caused the screwworm because the flies are not as prevalent in the cold weather.'
Although screwworms were eradicated from the U.S. in the 1960s using a sterilized fly technique, all the signs are there for a repeat scenario. As of March of this year, 369 confirmed cases had been reported in Mexico, creeping north from its confinement zone in Central America and towards the United States.
As the representative of the largest congressional district in Texas, I have heard repeatedly from my constituents that a reemergence of New World screwworm is their biggest concern. Texas tops the charts for beef production in the nation, and some of my district's counties have more sheep and goats than live human beings.
There is no doubt that a screwworm outbreak would be absolutely devastating to communities like mine. I am not alone in these concerns.
In March, 43 of my colleagues joined me in bipartisan outreach to the Agriculture Department to offer congressional support on screwworm eradication efforts. I also introduced the STOP Screwworms Act along with 31 of my House colleagues and Sens. John Cornyn (R-Texas), Ted Cruz (R-Texas), Cindy Hyde-Smith (R-Miss.), Ben Ray Lujan (D-N.M.), and Martin Heinrich (D-N.M). This important legislation would establish a sterile fly production facility in the U.S. — a critical step in our fight to shore up our domestic infrastructure against this deadly parasite.
Fortunately, Agriculture Secretary Brooke Rollins has been incredibly proactive on this issue. This week, I joined Rollins to announce the launch of an $8.5 million sterile New World screwworm fly dispersal facility in South Texas and a five-pronged plan to enhance the Agriculture Department's ability to detect, control and eliminate this pest. Per the Agriculture Department, the facility in South Texas is expected to be ready within six months.
President Trump and Rollins have made protecting America's agriculture industry a priority. Together, we will fight to codify executive branch wins into long-term legislative solutions.
Tony Gonzales represents Texas's 23rd District in the U.S. House of Representatives. He serves as the chairman of the Congressional Hispanic Conference and represents the largest congressional district in Texas, spanning over 800 miles of the southern border.