Full Breakdown
New World Screwworm Detected Near U.S.–Mexico Border Sparks Federal and State Response
6/3/2026, 5:42:54 AM
Immediate Detection Near Texas Border
The U.S. Department of Agriculture (USDA) confirmed that a New World screwworm-infested 5-year-old goat was found in Coahuila, Mexico, approximately 25 miles from the Texas border. A separate report identified a 6-month-old sheep about 31 miles from the border. USDA officials are tracking 32 cases in Coahuila, 19 of which remain active, and have recorded more than 26,000 cases across Mexico since the outbreak began in late 2024.
Background & Context
The parasitic fly, which feeds on warm-blooded animals, was eradicated from the United States in the 1960s through a sterile-fly program. Over the past three years it has migrated northward from South America and the Caribbean, aided by warmer temperatures. A 2024 human case in Maryland, linked to travel in El Salvador, highlighted the parasite’s capacity to affect people, though no U.S. transmission has been documented.
Data & Statistics
- Total Mexican cases: >= 26,216; active: ? 2,700 (USDA).
- Coahuila: 32 cases, 19 active; overall active cases in Mexico: ? 1,800–2,000.
- USDA surveillance: 8,000 traps, 58,000 fly samples, 19,000 wildlife specimens – none positive in the United States.
- Sterile-fly releases: >= 100 million per week, scaling to 300 million weekly from a new $750 million facility at Moore Air Base, South Texas.
- Economic estimates: potential loss of $1.8-$2 billion to Texas cattle, $9-$10.6 billion nationally; USDA projects billions in broader economic damage if the pest spreads.
Why It Matters
An incursion could devastate Texas’s $15 billion cattle industry, drive up beef prices, and threaten wildlife, pets, and livestock in bordering states. Public-health risk remains low because the fly does not transmit disease and requires open wounds to lay eggs.
Official Statements & Responses
USDA Secretary Brooke Rollins emphasized that the screwworm is not present in the United States and that the risk to animals and people is “very low.” She outlined a five-pronged plan: border port closures, intensified surveillance, sterile-fly releases, rapid communication, and coordinated response teams. Texas Agriculture Commissioner Sid Miller warned that “it is just a matter of time” before the parasite reaches Texas directly and urged deployment of all available resources. UC Davis cattle disease expert Michael Payne said the proximity “significantly raises the urgency” for additional resources. USDA Under Secretary Dudley Hoskins noted the public-health threat is “extremely low.” Texas Animal Health Commission (TAHC) director Bud Dinges reported expanded personnel, outreach, and ground release sites in South Texas.
Criticism & Opposition
State Rep. Don McLaughlin claimed the flies were detected as close as one mile from the border and called for a Texas-led emergency response modeled on Operation Lone Star. He described the threat as “at our doorstep.” Rollins labeled the one-mile claim “false information” that “causes significant panic.” Several Texas officials have expressed frustration that federal actions have been “snail’s pace.”
Conflicting Reports & Gaps
Sources differ on the exact distance of the nearest case: USDA and CBS report 25 miles; Reuters and FarmPolicyNews cite 31 miles; Rep. McLaughlin asserted a one-mile proximity, which USDA has not verified. No positive U.S. samples have been identified, but the timeline of northward spread remains uncertain.
Verbatim Quotes
- “There's 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
- “ In a statement to USA TODAY, Texas Agriculture Commissioner Sid Miller said it was "just a matter of time" before the parasite impacts Texas directly.” — Sid Miller, Texas Agriculture Commissioner
- “The scale and technological prowess of our response to New World screwworm has been unprecedented,” — Brooke Rollins, U.S. Secretary of Agriculture
What’s Next
The USDA will complete the Moore Air Base sterile-fly facility, increase weekly releases, and continue bi-daily briefings. TAHC will maintain heightened border surveillance, expand outreach to ranchers, and enforce rapid reporting protocols. Should a U.S. case be confirmed, USDA plans to enact quarantines, movement restrictions, and intensified trapping and sterile-fly deployments per existing contingency guidelines.
