The 2025–2026 screwworm outbreak reaching the US was a deliberately released bioweapon or a Gates/Oxitec genetic attack on the cattle herd
Where the evidence lands: FalseThat the screwworm, a flesh-eating parasitic fly, did not spread back into the United States through natural range expansion and animal smuggling, but was intentionally introduced: released as a bioweapon or act of sabotage against US cattle and the food supply, engineered or seeded by Bill Gates or Oxitec through genetic-insect research, and (in a partisan version) triggered by Department of Government Efficiency cuts to the programs that had held the fly at bay.
Believed by: Circulated on social media and podcasts as the fly was detected in Texas in June 2026
The full story
A real fly, and a frightening story wrapped around it
In June 2026, USDA inspectors confirmed a New World screwworm in a calf in Zavala County, Texas: the first case in US livestock in decades. The parasite is as grim as it sounds. Its larvae feed on the living flesh of warm-blooded animals, and left unchecked it can devastate herds and wildlife. The detection set off real alarm about the cattle supply, beef prices, and the southern border, and it drew an emergency federal response measured in the billions.
Almost immediately, a second story grew up alongside the first. Across podcasts and social feeds, the outbreak was recast as no accident at all: a bioweaponreleased to sabotage the American cattle herd, a “genetic pincer” engineered by Bill Gates and the biotech company Oxitec, or, in a more partisan register, a disaster manufactured by budget cuts. The rated claim on this page is that intentional-attack reading in all its variants. It is debunked. The task is to separate the documented, serious resurgence from the accusation of deliberate design laid over it.
Why the fear finds purchase
Give the suspicion its strongest form, because parts of it start from true and unsettling facts. The threat is real: a flesh-eating fly advancing north toward the world's most valuable cattle industry is not a phantom, and the government's own response, roughly $1.3 billion in emergency money and a crash program to breed sterile flies, signals how seriously officials take it.
The system really did fail. A biological barrier that had held for years collapsed after 2023, and screwworm marched through every country in Central America into Mexico and then across the border. Monitoring money really was cut: the Department of Government Efficiency eliminated a broad swath of USAID and FAO grants in 2025, some touching animal-disease surveillance in the region, days before the US moved to reopen cattle trade with Mexico. And the villains the theory reaches for are pre-cast. Years of unrelated claims about Bill Gates, genetically modified insects, and Oxitec meant that the moment an insect-and-agriculture emergency appeared, a ready-made narrative was waiting to absorb it. Layer a frightening parasite over a failed program over a budget-cut controversy over familiar biotech suspicion, and the raw material for “someone did this on purpose” is all present. What the theory adds, and cannot support, is the intent.
What actually let the fly back in
The screwworm is not an exotic engineered agent; it is a native pest of the Americas that the United States spent decades and a fortune beating back. The tool that did it, the sterile-insect technique, was developed by USDA scientists Edward Knipling and Raymond Bushland in the 1950s: release enough radiation-sterilized male flies and wild females mate without producing offspring, and the population collapses. By 1966 the US was declared free of the fly, and over the following decades the eradication line was pushed all the way south to the Darien Gap in Panama, held there by a joint US-Panama facility, COPEG, producing about 100 million sterile flies a week.
That barrier is what failed, and the failure is documented rather than mysterious. In 2023 annual detections in Panama leapt from around 25 to more than 6,500, and the fly moved north through Costa Rica, Nicaragua, Honduras, Guatemala, Belize, and El Salvador into Mexico. Scientists at the CDC, USDA, and in the research literature point to a convergence of ordinary causes: COVID-era disruption to sterile-fly operations during a critical window, heavier movement of livestock and people, favorable weather, an aging COPEG plant flagged as a high-priority repair case as far back as 2023, and cartel-linked illegal cattle smuggling that carried infested animals past inspection. CNN documented the smuggling strand in detail. None of this requires, or shows, a hand releasing the fly on purpose. It shows a containment system that lapsed and a pest that did exactly what an uncontained screwworm does.
The Gates, Oxitec, and sterile-fly strands invert the facts
The biotech version of the theory collapses on the details. The sterile-insect technique fighting this outbreak uses conventional radiation, not genetic engineering, and the sterile males it releases cannot produce viable larvae; PolitiFact and USDA note they pose no risk to animals or people. Releasing sterile males is a population-collapsetool, the exact opposite of seeding an infestation. The claim that the government's own eradication flies are the weapon turns the technique upside down.
The Gates-and-Oxitec “genetic pincer” fares no better. Oxitec's genetic work has centered on other species, mosquitoes and, in Gates Foundation-funded laboratory research, cattle fever ticks in the UK, not the screwworm, and the company says none of its engineered insects were released in any way tied to this outbreak. Fact-checkers have separately debunked a companion claim that Gates-funded ticks were engineered to make people allergic to red meat, a story that conflates different tick species and a syndrome documented years before the grant it blames. The screwworm version simply borrows that debunked scaffolding and swaps in a different insect. Across every strand, the pattern is the same: unrelated projects and species, stitched together into a plot that the underlying science does not support.
The DOGE sub-claim: a real dispute, not a proven cause
The most mainstream version of the “someone did this” story is partisan rather than fringe: that DOGE budget cuts caused the outbreak. This one is worth taking on its own terms, because it sits on a genuine policy fight. DOGE did eliminate thousands of USAID and FAO grants in 2025, and some touched animal-disease monitoring in Central America. But when Snopes examined whether those cuts caused the June 2026 US detection, it rated the claim unproven: the reporting connecting the cuts to screwworm work specifically rested on an anonymous source, and no evidence established the causal chain.
FactCheck.org went further and found both sides spinning. The barrier had already begun collapsing in 2023, under the prior administration, which approved roughly $275 million in emergency screwworm funding late that year, so Republican claims that nothing had been done were wrong; and Democratic claims pinning the whole outbreak on DOGE outran the evidence. Experts told the outlet the program had systemic weaknesses reaching back to the early 2000s and needed external review. In other words, the honest reading is diffuse institutional failure across years and borders, not a single villain, and certainly not a deliberate release. A budget-cut controversy is a legitimate argument about competence and priorities; it is a category away from the claim that the fly was weaponized on purpose.
Where the evidence lands
On the claim as stated, that the screwworm's return was an intentional act, a bioweapon, an act of sabotage, or a Gates/Oxitec genetic attack, the verdict is debunked. The fly is a known parasite, its northward spread is documented country by country, the causes are ecological and administrative, the sterile flies are a cure and not a weapon, the biotech firms named were not involved, and the partisan sub-claim about DOGE cuts was rated unproven by the fact-checkers who tested it.
None of that means the crisis is small or that no one made mistakes. A barrier failed, surveillance was cut in a way still being argued over, smuggling outran enforcement, and a serious pest is now inside the US border with real consequences for herds and prices. Those are worth fixing and worth fighting about. The move that fails is the leap from “a containment system broke and a dangerous fly came back” to “therefore someone released it on purpose.” Follow each thread to its source and the deliberate hand is never there; what is there is an old parasite, a lapsed defense, and a frightening story reaching for an author it cannot name.
What's still unexplained
- Why exactly the Panama barrier collapsed when it did is still being untangled. Scientists point to COVID-era disruption, livestock movement, weather, cartel-linked cattle smuggling, and an aging COPEG facility flagged as high-priority for repair as far back as 2023, but assigning weight to each factor is an open scientific and administrative question, not a settled one.
- How much the 2025 DOGE cuts to USAID and FAO monitoring degraded Central American surveillance is genuinely disputed. That it is a real policy question is why the blame game resonates; that it is unresolved does not make it a deliberate cause, and Snopes rated the direct causal claim unproven.
- Whether the sterile-fly production ramp can reach the roughly 500 million flies a week needed to push the fly back south, and how long eradication will take, remains uncertain and consequential for cattle markets and the border.
- The role of illegal cattle smuggling in speeding the fly's spread is real and only partly quantified; better enforcement data would sharpen the picture without supporting any claim of intentional release.
Point by point
The claim: The screwworm's return to the US was engineered and released as a bioweapon to sabotage American cattle and the food supply.
What the record shows: The New World screwworm (Cochliomyia hominivorax) is a long-known native pest of the Americas, not a novel agent. Its 2023–2026 spread is documented step by step, from Panama north through every Central American country into Mexico and across the border, and matches the known behavior of a fly whose containment lapsed. USDA, CDC, and independent researchers attribute the resurgence to a failed sterile-fly barrier, pandemic-era disruption, animal movement, and weather. No agency or investigation has found evidence of a deliberate release, and none of the viral 'bioweapon' claims point to a verifiable engineered strain, delivery method, or actor.
The claim: Bill Gates and the biotech firm Oxitec created or seeded the screwworm through genetic-insect research.
What the record shows: The sterile insect technique the US actually uses relies on conventional radiation sterilization, not genetic engineering, and it is the tool fighting the outbreak, not causing it. Oxitec's genetic work has centered on other species (mosquitoes and, in Gates Foundation-funded lab research, cattle fever ticks in the UK), not the screwworm, and Oxitec says none of its engineered insects were released into the wild in a way connected to this outbreak. Fact-checkers have separately debunked a related 'Gates ticks made you allergic to red meat' claim that gets folded into the screwworm story; both conflate unrelated projects and species.
The claim: Sterile flies released by the government are themselves the danger, or the mechanism of the attack.
What the record shows: Sterile male flies cannot produce viable larvae; PolitiFact and USDA note they pose no risk to animals or people and are the reason the fly was eliminated from the US in 1966 and from a 2017 Florida Keys outbreak. Releasing sterile males is a population-collapse tool, the opposite of seeding an infestation. Framing the eradication program's own flies as the weapon inverts what the technique does.
The claim: DOGE budget cuts caused the June 2026 US outbreak.
What the record shows: Snopes rated this unproven. DOGE did eliminate a broad set of USAID and FAO grants in 2025, some touching animal-disease monitoring in Central America, but the reporting tying that to screwworm containment rested on an anonymous source, and no evidence establishes that the cuts caused the June 2026 Texas detection. FactCheck.org found both parties spinning: the barrier had begun collapsing in 2023 under the prior administration, which approved roughly $275 million in emergency screwworm funding in late 2023, and experts describe systemic weaknesses in the program dating to the early 2000s. It is a real policy dispute, not a proven single cause and not a deliberate act.
The claim: The scale of the government response proves the outbreak was intentional or catastrophic by design.
What the record shows: A large response reflects a serious pest, not a plot. USDA received about $1.3 billion in emergency funding, is expanding sterile-fly dispersal by ground and air, dedicated roughly $21 million to convert a Mexican fruit-fly facility, and began building a screwworm-fly factory in Texas, because eradication requires releasing on the order of 500 million sterile flies a week and current output is far below that. Urgency is the expected reaction to a flesh-eating livestock parasite that once cost the US cattle industry heavily; it is not evidence of sabotage.
Timeline
- 1966The United States is declared free of the New World screwworm after a campaign using the sterile-insect technique, in which vast numbers of lab-reared, radiation-sterilized male flies are released so that wild females mate without producing offspring. The method was pioneered by USDA researchers Edward Knipling and Raymond Bushland in the 1950s.
- 1994–2006The eradication line is pushed south to the Darien Gap in Panama. A joint US-Panama facility, COPEG, is built to mass-produce sterile flies (roughly 100 million a week) and maintain a biological barrier keeping the fly penned in South America.
- 2023The barrier fails. Annual screwworm detections in Panama jump from about 25 to more than 6,500. Cases spread north through Costa Rica, Nicaragua, Honduras, Guatemala, Belize, and El Salvador. Scientists cite COVID-era disruption to sterile-fly operations, heavier livestock movement, and favorable weather.
- 2025-03Reporting notes that the US Department of Government Efficiency had cut a range of USAID and FAO grants, some tied to animal-disease monitoring in Central America. An anonymously sourced Agri-Pulse item links the cuts to screwworm work, seeding a later 'DOGE caused it' narrative.
- 2025-08US health officials confirm the country's first travel-associated human screwworm case, in a person who returned from El Salvador. No US-acquired human infestation is reported.
- 2026-06-03USDA-APHIS confirms the first US animal case: a calf in Zavala County, Texas. The individual animal recovers, but the detection prompts border, trade, and beef-price alarm. By mid-June officials tally roughly a dozen animal cases across Texas and New Mexico.
- 2026-06As the fly reaches Texas, intentional-attack claims spread online: podcast segments and posts frame the outbreak as a 'bioweapon,' 'border sabotage,' or a 'Gates and Oxitec genetic pincer' against US cattle. In parallel, Democrats and Republicans trade blame over DOGE cuts and prior-administration funding.
- 2026-06 to 2026-07Snopes rates the DOGE-caused-it claim unproven, and FactCheck.org concludes both parties are spinning blame, with experts pointing to systemic problems in the eradication program going back to the early 2000s rather than any single decision or deliberate act.
False. The New World screwworm is a known parasite the US eradicated in 1966 with the sterile-insect technique, now re-expanding north for documented reasons: a lapsed sterile-fly barrier in Panama, COVID-era disruption, cartel-linked cattle smuggling, and favorable weather. There is no evidence it was released as a weapon or engineered by Bill Gates or Oxitec. The partisan sub-claim that DOGE budget cuts caused it was rated unproven by Snopes, and FactCheck.org found both parties spinning blame.
Reviewed by The Conspiratory Editors · Last reviewed July 24, 2026 · How we rate
Sources
- 1.Democrats' and Republicans' Screwworm Blame Spin, FactCheck.org (2026)
- 2.Did DOGE cuts cause screwworm outbreak in US? We investigated, Snopes (2026)
- 3.Sometimes fighting dangerous pests like screwworms and mosquitoes means sterilizing bugs, PolitiFact (2026)
- 4.USDA Confirms Presence of New World Screwworm in the United States, USDA Animal and Plant Health Inspection Service (2026)
- 5.New World Screwworm Outbreak: Situation Summary, Centers for Disease Control and Prevention (2026)
- 6.USDA races to breed sterile flies to combat screwworm in Texas, The Texas Tribune (2026)
- 7.Political blame game follows as screwworm parasite threatens cattle in Texas, PBS NewsHour (2026)
- 8.Flesh-eating screwworm has reached the US, a comeback driven by organized crime, CNN (2026)
- 9.New World Screwworm: Rise, Fall and Resurgence, American Society for Microbiology (2025)
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