Full Breakdown
New World Screwworm Detected Near the U.S.–Mexico Border Sparks Federal Response
6/4/2026, 9:13:40 AM
Near-Border Detection and Texas Suspected Case
On May 30 2026 the U.S. Department of Agriculture (USDA) reported a New World screwworm ( *Cochliomyia hominivorax* ) found in a five-year-old goat in Coahuila, Mexico, ? 25 miles south of the Texas border. The following day, USDA officials announced a presumptive positive sample from two three-week-old calves on a ranch near La Pryor, Texas—about 50 km from the border. Samples were sent to the National Veterinary Services Laboratory in Ames, Iowa, for confirmatory testing while USDA personnel were deployed to the area.
Background and Recent Spread
The screwworm, once endemic to the southern United States, was eradicated by a sterile-male release program in 1966. Since 2023 the parasite has been moving northward through Central America and Mexico. USDA data show 26,216 cases identified in Mexico to date, with ? 2,700 still active. In Coahuila alone, 32 cases have been recorded, 19 of which are active. The 25-mile proximity marks the closest confirmed detection to U.S. soil since at least 2024.
Data and Statistics
- Total Mexican cases (all years): 26,216
- Active Mexican cases (latest count): ? 2,700 (USDA) / ? 1,800 (Texas Tribune) – discrepancy noted.
- Coahuila cases: 32 total, 19 active.
- Distance to U.S. border: 25 miles (? 40 km).
- USDA surveillance: 8,000 traps near the border, > 58,000 fly samples examined, 19,000 wild-animal specimens tested, none positive for screwworm.
- Sterile-fly releases: ? 100 million /week in Mexico and border zones; 4 million released in Texas after the Texas case; planned capacity 300 million /week from a new Moore Air Base facility.
Official Statements & Responses
USDA Secretary Brooke Rollins emphasized that “the risk to the public and food safety is low” and that the agency has “activated personnel on the ground and is working with local partners.” Texas Animal Health Commission Director Bud Dinges announced a 20-km quarantine zone around the Texas detection and urged owners to keep animals within the zone. USDA Under Secretary Dudley Hoskins noted the department “invested heavily in the tools needed to eliminate NWS.”
Criticism and Opposition
Texas Agriculture Commissioner Sid Miller called the federal response “slow, bureaucratic and incomplete,” urging deployment of the Screwworm Adult Suppression System. Rep. Don McLaughlin (R-Uvalde) claimed a detection “one mile” from the border and demanded a state-led emergency response, a claim Rollins labeled “false information.” Rep. Chip Roy (R-TX) warned that the pest could cause “nearly $2 billion” in Texas losses.
Conflicting Reports & Gaps
Sources differ on the Texas case status: some (e.g., USDA press releases) treat it as a confirmed infection, while Reuters and the Texas Animal Health Commission describe it as “unconfirmed.” Distance claims also vary—official USDA figures cite 25 miles, whereas Rep. McLaughlin asserted a 1-mile proximity. Active case counts in Mexico range from ? 1,800 to ? 2,700, reflecting differing reporting windows. No confirmed U.S. cases exist as of this writing.
Verbatim Quotes
- “There is no doubt that this is a very, very serious threat to our livestock.” — Brooke Rollins, U.S. Secretary of Agriculture
- “When that false information gets out, it causes significant panic,” — Brooke Rollins, U.S. Secretary of Agriculture
- “At this point, it's unconfirmed that it's the New World screwworm,” — Don McLaughlin, Texas Representative
- “We have confirmed the first official case of New World Screwworm in Texas,” — USDA spokesperson
- “USDA invested heavily in the tools needed to eliminate NWS ever since cases started increasing in Central America and Mexico.” — Dudley Hoskins, Under Secretary for Marketing and Regulatory Programs
- “Rollins said the risk to the public and food safety is low.” — Brooke Rollins, U.S. Secretary of Agriculture
What’s Next
USDA plans to expand sterile-fly production, with a $750 million facility at Moore Air Base slated to reach full capacity by 2027. Ongoing aerial and ground releases will target the 20-km quarantine zone, while border traps and surveillance continue. The agency will issue updates as laboratory results return and will maintain weekly briefings to address misinformation and coordinate with Mexican authorities.
