Flesh‑Eating Fly Invades Texas

A flesh‑eating livestock parasite that America beat decades ago is back on U.S. soil, and whether we stay ahead of it now depends on how fast our border biosecurity and farm system respond.

Story Snapshot

New World screwworm has been confirmed in Texas cattle, reviving a dangerous pest once eradicated from the United States.
Trump-era agriculture and health officials say human risk is low, but the threat to ranchers, wildlife, and food prices is very real.
Washington and Texas leaders are rolling out sterile-fly releases, checkpoints, and movement controls to stamp out the outbreak.
Conservatives are watching closely to ensure this fight stays focused on real biosecurity, not new regulations or “climate” agendas.

What Exactly Came Back — And Why Ranchers Are Alarmed

The New World screwworm is a parasitic fly whose larvae do something most readers find hard to even picture: they eat the living flesh of warm‑blooded animals, not dead tissue like a normal maggot.^[20] Female flies lay eggs in fresh wounds on cattle, sheep, deer, pets, and, in rare cases, people.^[18] When the eggs hatch, hundreds of larvae burrow deeper into the animal, causing severe pain, infection, and often death if no one catches it in time.^[18]

Older ranchers remember why this bug was once called one of the most destructive parasites in American agriculture.^[18] Before eradication in the 1960s, screwworms cost U.S. producers hundreds of millions of dollars a year in lost animals and treatment.^[26] Texas experts now warn that, if the pest spreads again, losses could reach into the billions for the cattle and hunting industries in that state alone.^[12] That is why even a handful of confirmed cases in Texas livestock has set off alarms across farm country.^[1]

How It Reached the Border — And What Officials Are Doing Now

Since 2023, a regional outbreak has marched north through Central America and Mexico, infecting livestock, pets, wildlife, and even people.^[3] As cases grew, federal officials blocked imports of cattle, horses, and bison from affected parts of Mexico to slow the pest’s advance toward Texas ranch country.^[12] Despite those steps, federal agriculture inspectors confirmed New World screwworm in a three‑week‑old calf in Zavala County, Texas — the first U.S. animal case in this outbreak.^[1]

Once that Texas calf tested positive, the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service moved into its “playbook” response.^[1] That plan includes aggressive surveillance, movement controls in affected zones, and mass release of sterile screwworm flies that mate with wild ones but produce no offspring.^[2] This same sterile‑fly strategy helped win the original eradication fight and is now being scaled up again, including a new sterile‑fly production facility in South Texas to cover the border region.^[2]^[25]

Low Human Risk, High Stakes for Food and Freedom

The Centers for Disease Control and Prevention say clearly that, so far, there are no locally acquired human screwworm infestations in the United States and that the risk to people remains low.^[3] Unified government guidance adds that this is not a food‑safety issue; the food supply remains safe because screwworms do not infest meat and every slaughter animal is inspected.^[1]^[17] Health officials stress that most Americans face more risk when traveling to outbreak areas abroad than from this Texas cluster itself.^[13]

🚨New World Screwworm Update🚨
15 cases have been confirmed in total across the U.S, with 12 cases active in Texas. We have been preparing for this, and I am working with USDA @SecRollins to combat this pest, protect our livestock industry, and mitigate economic impacts. Read the…

— Rep. Monica De La Cruz (@RepMonicaDLC) June 22, 2026

Where the risk is not low is for producers. Federal and academic reviews warn that once screwworm gains a foothold in a warm state like Texas, its population can explode in calves’ navels and in any open wound on a cow, hog, or deer.^[20]^[25] That means real danger to family ranches, hunting leases, and rural communities that already live with thin margins, high fuel costs, and years of government‑driven inflation. Fewer healthy animals on pasture almost always ends with higher prices at the meat counter.^[16]

Why This Matters for Border Security and Conservative Priorities

For many readers, the word “border” probably jumped out. This outbreak fits a pattern ranchers along the Rio Grande know too well: when other countries fail to contain disease, American producers pay the price unless federal border security and inspection stay tight.^[24] Screwworm’s northward march from Panama into southern Mexico forced the United States to act, but it also shows how porous systems and slow international enforcement can put American herds at risk.^[6]^[12]

Conservatives will also watch how agencies handle new powers tied to this outbreak. Intensive surveillance, animal checkpoints, and movement controls can be necessary to save herds, but they should stay targeted, temporary, and transparent. Texas leaders have already pressed Washington in the past when they felt federal response was “slow” or “inadequate” on screwworm, even as ranchers shouldered the costs.^[5] The Trump administration now has the chance to prove that strong federal action can protect both agriculture and individual liberty when it stays focused on the mission, not on expanding bureaucracy.

What Ranch Families and Pet Owners Should Do Next

For ranchers, the guidance is simple but serious: check animals often, especially young calves and any stock with fresh wounds.^[4]^[20] Watch for foul‑smelling sores, restless behavior, or visible maggots in navels, ears, branding marks, castration sites, or any injury.^[4]^[20] If you see anything that looks suspicious, isolate that animal, do not move it off the property, and contact your veterinarian and state animal health office right away so larvae can be identified.^[8]

Pet owners in South Texas and nearby areas should also examine dogs and outdoor cats for draining wounds and signs of discomfort.^[1]^[8] Keep any cuts clean and covered, and use screens or nets to limit flies where animals sleep.^[3] For people, health officials repeat the same basic message: human cases here are very rare and usually tied to travel, but any painful, smelly wound that does not heal deserves quick medical attention and honest travel history.^[3]^[14] Early action, not panic, is how ordinary citizens help keep this old enemy from regaining a permanent home in the United States.