Full Breakdown
New World Screwworm Returns to Texas: Response and Challenges
6/22/2026, 8:54:41 AM
Core Event: Parasite Breaches U.S. Border
In June 2026, the New World screwworm (NWS), a flesh-eating fly whose larvae feed on warm-blooded animals, was confirmed in multiple Texas counties and one New Mexico county. The USDA reported 15 domestic cases—including a lamb in Crockett County and two calves in Edwards County—while earlier state reports listed 12 cases. The infestations involve cattle, goats, sheep, a dog, and a lamb, prompting a statewide disaster proclamation covering all 254 Texas counties.
Background & Context: From Eradication to Re-emergence
The NWS was eradicated from U.S. livestock by the mid-1960s through a sterile-insect technique that released millions of non-reproductive males. A brief 1982 Texas cow case and a 2016-2017 Florida-Keys deer outbreak were the only post-eradication detections until the 2023 Central American outbreak in Panama and Costa Rica. The parasite subsequently moved north through Mexico, reaching Texas in early 2026.
Timeline of Recent Developments
- June 3, 2026 – First U.S. calf case confirmed in Texas.
- June 5, 2026 – Canada bans entry of Texas livestock from the prior 21 days.
- June 8, 2026 – USDA activates an Emergency Operations Center; Governor Abbott launches a dedicated website (screwworm.texas.gov).
- June 19-21, 2026 – USDA posts 12-15 confirmed cases; releases >130 million sterile males since January.
- June 21, 2026 – USDA breaks ground on a $750 million sterile-fly facility at Moore Air Base, Edinburg, slated for late 2027.
Data & Statistics
- Confirmed cases: 12 (state reports) vs. 15 (USDA).
- Sterile-fly releases: >130 million males in Texas (2026).
- Planned production: 400 million sterile flies weekly by next year.
- Funding: $750 million for the Edinburg facility; $100 million USDA allocation; $150 million research investment; $105 million awarded to Texas universities for detection and treatment projects.
Official Statements & Responses
Governor Greg Abbott emphasized that the new website consolidates maps, training, and reporting tools to protect livestock, wildlife, and rural communities. USDA Secretary Brooke Rollins highlighted the accelerated sterile-fly production and the “rapid response” dashboard for case tracking. Texas Agriculture Commissioner Sid Miller warned that delays increase the pest’s spread, while the Texas Animal Health Commission issued quarantine orders for 13 counties to restrict animal movement.
Criticism & Opposition
Animal-welfare groups caution that quarantine zones may force mass euthanasia in overcrowded shelters; Rebecca Giamona (Austin Pets Alive) warned of “mass, mass, mass euthanasias” without relocation options. The Harvard Law Animal Law & Policy Program warned that the proposed “Save Our Bacon Act” could nullify over 600 state biosecurity laws, potentially hampering response efforts. Producers also express reluctance to report infestations due to quarantine repercussions, as noted by Bernt Nelson of the American Farm Bureau Federation.
On-the-Ground Reports
Cases span a 170-mile radius: two calves in Edwards County, a lamb in Crockett County, a goat in La Salle County, and a small-breed male dog in Lea County, New Mexico. Veterinarians advise monitoring for draining wounds, maggots, or lesions near body openings and reporting to the Texas Animal Health Commission’s 24-hour line (1-800-550-8242).
Conflicting Reports & Gaps
Sources differ on the total case count (12 vs. 15) and on the exact timing of the first U.S. detection (June 3 vs. earlier 2023 reports of a calf). USDA acknowledges that sterile-fly releases prevent future generations but do not eliminate existing larvae, explaining ongoing detections in already-affected zones.
Verbatim Quotes
- “This new website puts essential tools in the hands of our producers, veterinarians and families,” — Greg Abbott, Governor of Texas
- “The parasite’s capacity to devastate the cattle industry cannot be overstated,” — Dr. Tyler Evans, epidemiologist
- “Every day we delay gives this pest another opportunity to spread.” — Sid Miller, Texas Agriculture Commissioner
- “Texas is no stranger to the New World screwworm threat and we are prepared to push this danger out of our state for good,” — Greg Abbott, Governor of Texas
- “There’s no magic concoction that’s going to fix this, this sterile insect technique or those sterile flies are the solution going forward.” — Karl Harborth, Texas A&M livestock specialist
- “Another challenge that we need to really pay attention to is that New World screwworm eradication relies heavily on the reporting of suspected cases.” — Bernt Nelson, American Farm Bureau Federation
What’s Next: Facilities, Technology, and Surveillance
The Moore Air Base sterile-fly plant will begin operations in late 2027, aiming to produce 750 million flies annually. USDA projects weekly output of 400 million sterile males by next year, complemented by AI-enabled traps from the University of Texas at Arlington and pyriproxyfen-laden sterile flies from Texas Tech. Ongoing public outreach, mandatory inspector certification, and cross-border monitoring remain central to preventing a broader outbreak.
