Flesh-Eating Maggots Hit Texas

A tiny flesh-eating maggot is forcing Texas to bet billions on bugs, border control, and time it does not have.

Story Snapshot

Flesh-eating screwworm has returned to Texas livestock after decades of being eradicated.
Federal officials confirmed multiple cases, triggering quarantines and a disaster-style response.
The main weapon is a massive “sterile fly” program that now faces a multi-year capacity gap.

Texas faces a parasite that literally eats cattle alive

New World screwworm is not a figure of speech; it is a fly whose larvae eat living flesh. The female lays eggs in an open wound or moist area on a warm-blooded animal. When the eggs hatch, the maggots burrow into tissue and keep eating until the animal is treated or dies. Texas A&M AgriLife Extension calls it a serious threat to livestock, wildlife, pets, and in rare cases, people, and urges rapid reporting of any suspicious wounds.^[4]

For decades, this horror story was mostly history. The United States wiped out screwworm by the late 1960s using a landmark program that flooded the region with sterilized male flies. But the pest did not disappear from the Americas. It held on in Central and South America and has been pushing north again. Texas A&M now warns that the northern migration of New World screwworm poses a renewed threat to Texas producers, which is no longer theoretical.^[4]

Confirmed Texas cases turn an abstract risk into a real outbreak

The alert became real when federal officials confirmed New World screwworm in a three-week-old calf in Zavala County, southwest of San Antonio.^[3] Soon after, additional Texas cases appeared in cattle, a goat, and at least one dog tied to New Mexico.^[2] The United States Department of Agriculture and the Texas Animal Health Commission moved fast with quarantines, movement limits, and intensive surveillance in affected counties.^[2] On paper, the response followed the playbook. On the ground, ranchers saw a nightmare from the 1970s return.

Older Texans remember the last time. A 1976 screwworm outbreak hammered the state, causing around 330 million dollars in losses, which would be far higher in today’s dollars.^[1] Modern herds are already under pressure from drought, high feed costs, and a national cattle count near a 75-year low.^[2] That means every lost calf, every stressed cow, hits harder. Experts now warn that an unchecked outbreak today could blow past 2 billion dollars in damage and ripple into higher beef prices across the country.^[1]

Sterile flies are the main weapon, but the factory is years away

The core tool against screwworm is not a new drug. It is more flies. Scientists sterilize male screwworm flies and release them by the billions. These sterile males mate with wild females, which then lay eggs that never hatch. Over time, the wild population crashes. This strategy helped erase screwworm from the United States once before, and it is still central to today’s plan.^[2]

Here is the catch: you need staggering numbers of sterile flies, week after week. The United States now relies heavily on facilities in Mexico and Panama to produce these insects. That made sense when screwworm was someone else’s problem. It looks less wise now that the pest is again on Texas soil. The Department of Agriculture has announced a new sterile fly production facility as the centerpiece of a five-part national defense plan, with a price tag of about 750 million dollars and capacity for up to 300 billion sterile flies per week.^[1]

Three-year delay creates a dangerous window of vulnerability

The proposed facility could finally give the United States enough domestic supply to flood any outbreak zone without begging for foreign capacity. It is also not coming online soon. Even with fast funding and special treatment in Congress, planners expect at least three years before the plant becomes fully operational.^[1] For a parasite that can spread season by season up the map, three years is a very long time.

During that gap, officials must stretch current sterile fly supplies, juggle cross-border agreements, and hope nothing large breaks loose north of the Rio Grande. Border biology has been a known risk for years. Producers and state officials could fairly ask why a critical biosecurity factory that protects a trillion-dollar food system is treated like a slow, normal construction project instead of emergency infrastructure.

What matters now for Texas ranchers and American consumers

Ranchers do not have the luxury of waiting for perfect political clarity. Texas A&M urges owners to check animals often, isolate any with odd wounds, and call state or federal veterinary services right away.^[4]^[5] Treatment works when caught early. Quarantines and honest reporting help stop the bug from leapfrogging into new herds and new states. Those simple acts can save neighbors millions of dollars and keep a local problem from becoming a national crisis.

For the rest of the country, the immediate food supply remains safe. Screwworm damages animals, not the meat that reaches your plate, when animals are properly inspected.^[2] The real risk is cost and stability. If Texas, New Mexico, and other states lose too many animals or must live under long-term movement limits, beef prices and supply chains will feel it. The time to close the gap between the threat and our sterile fly capacity is now, not after the next wave of larvae hits fresh flesh.