Flesh-Eating Fly Invades Texas

A flesh‑eating livestock parasite once wiped out in America is back in Texas, forcing ranch country into a high‑stakes fight to protect cattle, wildlife, and our food supply.

Story Snapshot

New World screwworm has been confirmed in a Texas calf, ending nearly 60 years of freedom from this deadly parasite.
Federal and state teams are rolling out quarantines, checkpoints, and mass releases of sterile flies to stop the spread.
Officials say human risk and food-safety risk are low, but the economic threat to cattle and hunting industries is huge.
Border failures and foreign outbreaks helped this pest reach Texas, putting extra pressure on Trump-era agriculture and border policy.

What exactly is the New World screwworm and why ranchers are alarmed

New World screwworm is a parasitic fly whose larvae eat living flesh, not dead tissue, in warm‑blooded animals, including cattle, wildlife, pets, and in rare cases people.^[6] Female flies lay eggs in fresh wounds such as branding marks, castration cuts, tick bites, or the navel of newborn calves.^[18] Within days, hundreds of larvae can hatch and tunnel deeper into the wound, causing severe pain, infection, and often death if untreated.^[18] This pest once caused devastating livestock losses across the southern United States before it was eradicated in 1966 using an aggressive sterile‑insect campaign.^[21]

The United States Department of Agriculture’s Animal and Plant Health Inspection Service confirmed the parasite’s return in a three‑week‑old calf in Zavala County, Texas, with larvae found in its umbilical area.^[1] That site is a known danger zone in newborn livestock, because it is an open, moist wound that attracts egg‑laying flies.^[3] New World screwworm infestations can kill untreated cattle in about ten days, so early spotting and treatment are critical for ranchers trying to save their herds and stay in business.^[1]

How the outbreak reached Texas and what the government is doing now

This crisis did not begin on American soil. Since 2023, New World screwworm has spread north through Central America and Mexico, infecting livestock, wildlife, pets, and people and causing more than 185,000 animal cases and over 2,100 human cases.^[3] The Trump administration already moved to suspend imports of cattle, horses, and bison from parts of Mexico after detections there, trying to keep the pest from crossing the border.^[12] Despite these steps, flies or infested animals have now made it into Texas, exposing weaknesses in our broader border and trade controls.^[3]

Once the Texas calf was confirmed, the United States Department of Agriculture and Texas officials launched their New World screwworm response playbook.^[1] That plan includes movement controls, stepped‑up surveillance, and a proven tool from past battles: sterile‑fly releases.^[2] In South Texas, teams are deploying millions of sterile male flies from ground chambers and aircraft; when these males mate with wild females, they produce no offspring, driving the population down over time.^[2] Federal and state crews are also setting traps, staffing checkpoints, and working directly with landowners to pick release sites and inspect animals.^[2]

Is this a threat to people and food safety, or mainly an agricultural fight?

Public‑health agencies are trying to strike a careful balance between urgency and calm. The Centers for Disease Control and Prevention reports no locally acquired human screwworm cases in the United States in this outbreak and says the risk to people remains low and is limited to areas where the flies are active.^[3] The United States Department of Agriculture’s unified screwworm site stresses that this is not a food‑safety issue, and that inspected meat, fruits, and vegetables remain safe for families.^[7] Texas health officials echo that message, saying meat inspectors are checking animals for signs of infestation.^[17]

That reassurance does not mean the problem is small. Federal guidance and academic reviews both describe New World screwworm as a serious threat to livestock and wildlife, with the potential for major losses if detection and control are slow.^[7]^[3] Texas A&M experts estimate that, if the pest becomes established in the state, it could cost about 2.1 billion dollars to the cattle industry and 9 billion dollars to hunting and wildlife businesses in Texas alone.^[12] For rural communities already squeezed by past inflation, high fuel costs, and tight margins, that kind of damage would be devastating.

Lessons from past eradication and what conservative landowners should do now

History shows this parasite can be beaten, but only with strong, focused action. United States Department of Agriculture records call screwworm eradication one of the greatest success stories in American agriculture, achieved through heavy investment in sterile insects and tight cooperation with Mexico and Central America.^[21] Today’s scientists warn that reintroduction risk is permanent as long as the pest remains endemic to our south, and they call for strict animal‑movement rules, continuous surveillance, and rapid treatment when cases appear.^[2] That is exactly the kind of targeted, limited‑government response conservatives usually support: clear borders, clear rules, and practical science, instead of endless bureaucracy.

After being previously eradicated in the U.S. in the 1960s, the destructive livestock pest known as New World screwworm was discovered in a calf in Zavala County in the first week of June. Since then, 14 more domestic cases have been confirmed. https://t.co/bmWtfgqPZ0

— The Texan (@TheTexanNews) June 22, 2026

For ranchers and rural families, the marching orders are simple but serious. Owners should regularly check cattle, horses, and other animals for foul‑smelling wounds, restlessness, or visible maggots, especially around navels, ears, and branding or castration sites.^[20] Any suspected case should be isolated, reported immediately to a veterinarian, and then to the Texas Animal Health Commission or United States Department of Agriculture so larvae can be removed, identified, and the wound treated.^[8] Avoid hauling suspect animals, keep all wounds clean and covered, and work with trusted local vets rather than waiting for far‑off agencies to notice a problem.^[4]