Texas Is Staffing Up to Stop Screwworm at the Border. Here's What's Happening.

The Texas Animal Health Commission is converting vacant positions across the state into dedicated New World screwworm and ectoparasite inspector roles, deploying them along the border to monitor livestock and fly traps as the parasite continues to advance through northern Mexico.

Deputy Executive Director T.R. Lansford confirmed the staffing shift, describing the reassigned inspectors as frontline responders in the effort to keep the flesh-eating fly out of Texas. The commission is also evaluating whether the current staffing level is sufficient for the Rio Grande Valley, with any expansion beyond existing vacancies requiring legislative authorization from Austin.

Why This Parasite Demands Immediate Attention

New World screwworm, Cochliomyia hominivorax, is not a nuisance pest. It is a primary screwworm, meaning the larvae infest living tissue in healthy animals, not just wounds or carrion. Female flies lay eggs at the edges of wounds, including natural openings, and the larvae burrow into living flesh, feeding and expanding the wound as they develop. Without treatment, infestations are fatal.

The parasite was eradicated from the United States in 1966 through a landmark sterile insect technique program, one of the most successful eradication campaigns in agricultural history. Its re-emergence in northern Mexico, with confirmed cases in Nuevo León, is a serious signal that the buffer zone between the current infestation and the U.S. border is narrowing.

What Veterinary Professionals Need to Know

For veterinarians practicing in Texas, particularly in mixed animal and large animal settings near the border, screwworm should now be on the differential list for any livestock wound that is not healing as expected or that shows unusual larval activity. Clinical signs include restlessness, off-feed behavior, and visible larvae in wounds. The odor associated with active infestations is distinctive.

Early detection is critical, both for the individual animal and for the broader surveillance effort. Any suspected cases should be reported immediately to the Texas Animal Health Commission and USDA APHIS. Federal and state agencies are actively tracking the parasite's movement, and confirmed or suspected cases in livestock contribute directly to the surveillance map guiding the response.

Fly traps along the border are part of the early warning infrastructure. The inspector positions being filled now are the human component of that same system.

The Bigger Picture

Screwworm re-establishment in the United States would represent a significant setback for the livestock industry, with economic consequences that would extend well beyond the border region. The 1966 eradication cost years of coordinated effort across multiple countries. Prevention is substantially cheaper than another eradication campaign.

The TAHC's decision to move quickly, converting existing vacancies rather than waiting for new positions to be funded, reflects the urgency of the situation. Texas ranchers along the border have already been urged to monitor their herds closely. The addition of dedicated inspectors adds institutional capacity to what has so far been largely producer-level vigilance.

Veterinary professionals in the region are a critical link in that chain.

TAGS: screwworm, parasitology, Texas, livestock, border surveillance, TAHC, USDA, large animal, ectoparasites, disease prevention, food animal