Flesh-Eating Fly Breaches Texas

June 24, 2026

Close-up of a black and white dairy cow with ear tags in a green field

A flesh-eating livestock parasite once wiped out by the government has slipped back over the border, and now Americans have to trust the same fragile system to stop it again.

Story Snapshot

The New World screwworm, a flesh-eating fly once eradicated from the U.S., is now confirmed in Texas livestock.
Federal and state agencies are rolling out movement controls, intensive surveillance, and massive sterile-fly releases to keep it from spreading.^[1]^[2]
Experts say the direct risk to people is low for now, but the economic danger to ranchers, wildlife, and the food system is high.^[3]^[6]^[12]
The fight exposes deeper worries on both right and left about slow, reactive government and America’s fraying biosecurity defenses.^[2]^[5]

What Exactly Is This Screwworm, And Why Ranchers Are Alarmed

The New World screwworm is a fly whose larvae eat the living flesh of warm-blooded animals, not dead tissue like normal maggots.^[18]^[20] Female flies lay eggs in fresh wounds, umbilical cords on newborn calves, or even small cuts, and hundreds of larvae can quickly burrow deeper into the flesh.^[18]^[21] Untreated animals suffer extreme pain, foul-smelling wounds, infections, and can die within days.^[1]^[20] This parasite can infest cattle, wildlife, pets, and, in rare cases, people, turning any open cut into a serious threat.^[6]^[18]

Federal officials say this pest was eradicated from the United States in the 1960s using the “sterile insect technique,” in which labs raised and released millions of sterilized male flies to crash the population.^[21]^[24] That program was once hailed as one of the greatest success stories in American agriculture.^[21] But since 2023, screwworm has surged north through Central America and Mexico, infecting more than a hundred thousand animals and thousands of people, and pressing against the Texas border.^[3]^[13]^[1] The new Texas cases prove that line has finally broken.

What Has Happened In Texas And How The Government Is Responding

The U.S. Department of Agriculture (USDA) confirmed screwworm in a three-week-old calf in Zavala County, Texas, marking the first U.S. animal case in this outbreak and the first on American soil in nearly sixty years.^[1]^[22] Texas has since declared an emergency as more livestock cases were reported, and USDA now tracks new detections across South Texas.^[7]^[10]^[11] In response, USDA and Texas agencies set up animal checkpoints, tightened movement rules, and launched ground and aerial releases of millions of sterile flies over infested zones to halt reproduction.^[1]^[2]^[7]

Federal health officials stress that the U.S. food supply remains safe, since screwworms attack live animals, not meat in stores, and inspected cattle cannot enter the food chain if they show signs of infestation.^[1]^[17] The Centers for Disease Control and Prevention (CDC) reports no locally acquired human screwworm cases in the United States and says the risk to people is low and tied mainly to travel in outbreak areas.^[3]^[13] Still, ranchers are told to inspect animals often, keep wounds clean and covered, and isolate and report any suspected infestations immediately to veterinarians and animal health officials.^[4]^[8]^[20]

The Real Stakes: Food, Wildlife, And A System Under Strain

For families, the biggest concern is not maggots in grocery-store meat but what this parasite could do to the cattle and wildlife that support rural economies and the broader food supply.^[7]^[18] Texas A&M experts estimate screwworm could cost the Texas cattle industry around $2.1 billion and the hunting and wildlife sector about $9 billion if it becomes established.^[12] Scientific studies warn that warm, livestock-heavy states like Texas are highly suitable for screwworm, meaning once the fly settles in, it can spread fast and become very hard and expensive to remove.^[2]^[3]^[26]

Pennsylvania farmers and pet owners are urged to tighten biosecurity to protect their livestock and pets following heightened risks of New World Screwworm (NWS) following confirmed cases in Texas and New Mexico.
Read more: https://t.co/hty0xHV97K pic.twitter.com/AUXtXK92il

— PA Veterinary Medical Association (@PaVMA) June 23, 2026

These numbers land in a country already angry about high food prices, supply shocks, and leaders who seem to react only after a crisis hits. Ranchers remember past battles over “globalist” trade policies and border control and now see a flesh-eating parasite pushed north by cross-border livestock movement and slow regulatory action.^[2]^[18] At the same time, many liberals who worry about climate change and the growing gap between rich and poor see another example of underfunded public-health and biosecurity systems struggling to keep up with predictable threats.^[3]^[25]

Trust, Politics, And What Ordinary People Can Do

The screwworm fight shows a familiar pattern in modern crises: government experts insist the situation is “serious but under control,” while people on the ground question whether the response is fast and honest enough.^[3]^[5] USDA and CDC stress that human risk is low and that a coordinated “One Health” approach, linking animal and human health, is in motion.^[3]^[7] Yet critics in Texas already call the early response “slow” and “inadequate,” and worry officials waited too long after warning signs from Mexico before ramping up protections at the border.^[5]^[13]

For now, both conservative and liberal Americans share a basic message: do not panic, but do not be passive. Rural residents can check livestock and pets for painful, foul-smelling wounds and get veterinary help quickly if they see larvae.^[1]^[8]^[20] Travelers to Central America or Mexico can lower their risk by using insect protection and keeping any wounds clean and covered.^[3]^[13] People who spot suspicious infestations in animals or themselves should seek professional care and report cases so experts can track and contain spread.^[3]^[6]^[20] Screwworm may be a test of whether American institutions can still act decisively before a biological threat spirals out of control.