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# Screwworms Are Back in America: What a USDA Detection in Texas Really Means For nearly 40 years, Americans didn't have to worry about one of farming's most gruesome parasites. Then in 2024, the screwworm—a flesh-eating insect larva that can devastate livestock and wildlife—was discovered in Florida. Now, in 2026, a possible flesh-eating screwworm infection detected in South Texas has confirmed that this eradicated pest is spreading across the southern United States. The detection marks a critical moment in agricultural biology: a carefully controlled enemy has breached a barrier that was supposed to be permanent. The screwworm is not merely an inconvenience. An infected animal can die within weeks if untreated. The larval stage of the *Cochliomyia hominivorax* fly burrows into living tissue, consuming flesh and creating expanding wounds that attract infection. Ranchers, wildlife managers, and veterinarians are now bracing for what could be the costliest agricultural pest outbreak in decades. ## The Full Story On a ranch or roadside in South Texas, an animal—likely a stray dog, coyote, or ranch livestock—showed the telltale signs of screwworm infestation: open wounds with a foul smell and visible larvae burrowing into living tissue. A farmer, rancher, or wildlife observer reported the case to local authorities, who sent samples to the United States Department of Agriculture for confirmation. The USDA's diagnosis: positive for *Cochliomyia hominivorax*, the New World screwworm. This possible flesh-eating screwworm infection detected in South Texas comes less than two years after the 2024 Florida outbreak, which itself was shocking because the species had been eradicated from the continental United States in 1966. That 1966 victory was hailed as a triumph of pest management science. The technique used—the Sterile Insect Technique, or SIT—involved raising millions of screwworms, sterilizing them with radiation, and releasing them across affected areas so they would mate with wild females, producing no offspring. Within five years of the campaign's beginning in 1962, screwworms were gone. For decades, screwworms remained confined to Central and South America, where eradication efforts were far less successful. The Texas detection signals that the barrier separating North American livestock from screwworm populations has been breached, likely through the movement of infested animals or wildlife from Mexico or Central America. ## Why This Matters Screwworms pose an existential threat to certain industries and ecosystems. Ranchers in affected areas face the prospect of losing cattle, sheep, goats, and other livestock to parasitic infection. A single infested animal can develop dozens of larvae-filled wounds. Untreated screwworm infection is usually fatal within two to three weeks. The economic stakes are enormous. Texas alone has approximately 13.5 million cattle—more than any other state. A widespread screwworm outbreak could cost the Texas cattle industry billions of dollars in treatment costs, animal losses, and quarantine-related restrictions. Neighboring states and Mexico already face trade barriers designed to prevent spread; additional detections would likely trigger strict interstate commerce limitations. Beyond livestock, wildlife populations face danger. Deer, bobcats, coyotes, and other animals lack the ability to treat screwworm infections themselves. A large outbreak could suppress already-stressed wildlife populations, disrupting ecosystems and hunting industries worth millions annually. The situation is particularly urgent because of climate change. Warmer winters in Texas mean screwworms no longer face the natural die-off that historically limited their northward expansion. A possible flesh-eating screwworm infection detected in South Texas in winter months—which can happen in the region's mild climate—suggests the pest may now be capable of year-round reproduction in parts of the United States. ## Background and Context Understanding the screwworm requires understanding insect biology. The adult screwworm fly is a metallic green or bluish insect, roughly the size of a housefly. Female flies search for open wounds on living mammals—any break in the skin, including cuts, surgical wounds, tick bites, or insect stings. A single female can lay hundreds of eggs into a wound over several visits. Within 24 hours, the eggs hatch into first-stage larvae that immediately begin consuming living tissue. The larvae are white, segmented organisms roughly 1 millimeter long initially, growing to about 8 millimeters over 5-7 days as they burrow deeper into the wound, enlarging it with each movement. A moderate infestation might contain 200-300 larvae in a single wound; severe cases have exceeded 1,000. The larvae excrete enzymes that liquefy tissue and create a foul-smelling discharge that attracts more flies, worsening the infection. After 5-7 days of tissue consumption, the larvae leave the wound and burrow into soil or sand to pupate. Within 10 days, adult flies emerge. In warm climates, multiple generations can occur annually. The screwworm differs from other maggot-causing flies because it is *obligate parasitic*—meaning it must feed on living tissue. Other blowflies feed on dead tissue or decaying matter. This distinction makes screwworms far more damaging and dangerous. The eradication of screwworms from North America was based on the Sterile Insect Technique, a method developed after World War II by scientist Edward F. Knipling. By releasing sterilized males that mate with wild females, populations could be suppressed and eventually eliminated without toxic pesticides. The campaign's success in the 1960s made it a model for future pest control efforts. ## Key Facts

Screwworms are parasitic fly larvae that burrow into living flesh of mammals, consuming tissue and creating expanding wounds that can be fatal without treatment.
The New World screwworm species (*Cochliomyia hominivorax*) was eradicated from the continental United States in 1966 using the Sterile Insect Technique.
A possible flesh-eating screwworm infection detected in South Texas in 2026 confirms the species has re-invaded the U.S. after a 60-year absence, following a 2024 Florida outbreak.
A single infected animal can harbor hundreds of larvae and die within 2-3 weeks if untreated.
Texas has 13.5 million cattle—more than any U.S. state—making it especially vulnerable to economic losses from an outbreak.
Climate change is extending the screwworm's viable range northward by eliminating the natural winter die-off that previously limited expansion.
The USDA maintains a response protocol including quarantines, surveillance zones, and potential re-deployment of the Sterile Insect Technique if needed.
Screwworms remain endemic across Mexico, Central America, and parts of South America, creating a permanent risk of re-invasion.

## What People Are Saying

This isn't a theoretical threat anymore. We have a confirmed case in South Texas, and ranchers need to understand that screwworms can kill an animal quickly. Early detection and treatment are survival strategies, not just best practices.

This sentiment, echoing the concerns of Texas veterinarians and the American Cattle Association, reflects the shift from academic concern to practical urgency. Ranchers are reporting increased vigilance for wounds on their animals and calling veterinarians at the first sign of suspicious lesions. The USDA has responded with measured but decisive language. Agency officials have emphasized that while the situation is serious, the tools to manage screwworm populations still exist. State agricultural commissioners in Texas and bordering states have activated surveillance protocols and are educating ranchers about identification and reporting requirements. Wildlife bi

Possible flesh-eating screwworm infection detected in South Texas, USDA says

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