# The 2025–2026 screwworm outbreak reaching the US was a deliberately released bioweapon or a Gates/Oxitec genetic attack on the cattle herd

**Verdict: Contradicted.** 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.

Category: Science, Space & Technology · Era: 2020s · First circulated: 2026 · Believed by: Circulated on social media and podcasts as the fly was detected in Texas in June 2026
URL: https://theconspiratory.com/theory/screwworm-bioweapon

## Summary
The claim that the New World screwworm's arrival in US livestock in 2025–2026 was no natural event but a deliberate act: a bioweapon released to sabotage the American cattle herd and food supply, a genetic attack tied to Bill Gates or the biotech firm Oxitec, or (in a partisan variant) an outbreak caused by DOGE budget cuts. A real, serious parasite resurgence sits underneath the story, along with a real sterile-insect eradication program and real supply and border worries. The intentional-attack reading laid over those facts is unsupported.

## The claim
That 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.

## Origin and timeline
- 1966: The 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.
- 1994–2006: The 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.
- 2023: The 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.
- 2025-03: Reporting 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.
- 2025-08: US 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.
- 2026-06-03: USDA-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.
- 2026-06: As 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 2026-07: Snopes 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.

## The evidence, claim by claim
- Claim: The screwworm's return to the US was engineered and released as a bioweapon to sabotage American cattle and the food supply.
  Evidence: 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.
- Claim: Bill Gates and the biotech firm Oxitec created or seeded the screwworm through genetic-insect research.
  Evidence: 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.
- Claim: Sterile flies released by the government are themselves the danger, or the mechanism of the attack.
  Evidence: 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.
- Claim: DOGE budget cuts caused the June 2026 US outbreak.
  Evidence: 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.
- Claim: The scale of the government response proves the outbreak was intentional or catastrophic by design.
  Evidence: 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.

## Why people believe it
- The threat is genuinely alarming. A flesh-eating fly whose larvae burrow into living animals, advancing toward the border and menacing the beef supply, is viscerally frightening, and fear primes people to suspect intent behind a bad event rather than accident and neglect.
- The word 'released' does double duty. The eradication program literally releases millions of flies, which makes it easy to twist a benign, decades-old technique into sinister-sounding 'they released the flies,' even though those flies are sterilized to collapse the population.
- There is a real villain-shaped gap. The barrier did fail, monitoring money was cut, and a program that should have worked did not, so a story that names a deliberate hand feels more satisfying than the truth of diffuse institutional failure across several countries.
- Bill Gates and biotech firms are pre-loaded suspects. Years of unrelated conspiracy theories about Gates, GMOs, and Oxitec mean any insect-and-agriculture story can be slotted straight into an existing narrative without new evidence.
- The outbreak arrived inside a partisan fight. With both parties already blaming each other over DOGE cuts and prior funding, the raw material for 'someone did this on purpose' was circulating in mainstream politics before the fringe versions escalated it to sabotage.

## Open questions
- 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.

## Sources
- Democrats' and Republicans' Screwworm Blame Spin, FactCheck.org (2026): https://www.factcheck.org/2026/07/democrats-and-republicans-screwworm-blame-spin/
- Did DOGE cuts cause screwworm outbreak in US? We investigated, Snopes (2026): https://www.snopes.com/news/2026/06/12/doge-cuts-screwworm/
- Sometimes fighting dangerous pests like screwworms and mosquitoes means sterilizing bugs, PolitiFact (2026): https://www.politifact.com/article/2026/jun/10/sterilizing-insects-screwworms-mosquitoes-disease/
- USDA Confirms Presence of New World Screwworm in the United States, USDA Animal and Plant Health Inspection Service (2026): https://www.aphis.usda.gov/news/agency-announcements/usda-confirms-presence-new-world-screwworm-united-states
- New World Screwworm Outbreak: Situation Summary, Centers for Disease Control and Prevention (2026): https://www.cdc.gov/new-world-screwworm/situation-summary/index.html
- USDA races to breed sterile flies to combat screwworm in Texas, The Texas Tribune (2026): https://www.texastribune.org/2026/06/24/new-world-screwworm-texas-sterile-flies-usda-trump-brooke-rollins/
- Political blame game follows as screwworm parasite threatens cattle in Texas, PBS NewsHour (2026): https://www.pbs.org/newshour/health/political-blame-game-follows-as-screwworm-parasite-threatens-cattle-in-texas
- Flesh-eating screwworm has reached the US, a comeback driven by organized crime, CNN (2026): https://www.cnn.com/2026/06/11/americas/screwworm-texas-cattle-smuggling-latam-intl
- New World Screwworm: Rise, Fall and Resurgence, American Society for Microbiology (2025): https://asm.org/articles/2025/september/new-word-screwworm-rise-fall-resurgence

Rated by The Conspiratory, a neutral, sourced encyclopedia of conspiracy theories. Full page: https://theconspiratory.com/theory/screwworm-bioweapon