Full Breakdown
New Mexico Records First Domestic Screwworm Case in a Dog
6/9/2026, 9:12:29 AM
First New Mexico Screwworm Detection
On June 8, 2026, USDA confirmed a male dog in Lea County, New Mexico, tested positive for New World screwworm. A Texas veterinarian reported the case, which was initially logged as a Texas incident before being reclassified as New Mexico’s domestic detection.
Background: Re-emergence of a Formerly Eradicated Parasite
New World screwworm, a fly whose larvae feed on live tissue, was declared eradicated in the U.S. in 1966 after a sterile-insect program. Since 2024 it has moved north from Mexico, establishing populations in south Texas and prompting border surveillance.
Timeline of U.S. Cases
The first U.S. detection was a calf in Zavala County, Texas, on June 3, 2026. Additional cases followed on June 5 (another Texas calf) and June 8 (a goat in Gillespie County, a calf in La Salle County, and the New Mexico dog). USDA reports five cases; state officials list four.
Economic Impact and Funding
Experts warn a Texas outbreak could cost up to $1.8 billion, echoing losses before 1966. In 2025 USDA earmarked $100 million for screwworm research, treatment stockpiles, and sterile-fly releases, deploying 75 responders.
Official Statements & Criticism
USDA undersecretary Dudley Hoskins said the situation is evolving and new information will emerge. New Mexico Agriculture Secretary Jeff Witte stressed detection to trigger sterile-fly releases and veterinary supplies. State Veterinarian Samantha Holeck announced extra traps and warned an “infested zone” could be imposed if breeding flies are found. USDA Agriculture Secretary Brooke Rollins pledged grant awards from the $100 million fund and said staff cuts have not impaired the response. Some Texas ranchers argue the response is too slow and insufficient for livestock protection.
On-the-Ground Situation
The dog remains under veterinary care in Texas. A goat in Gillespie County and a calf in La Salle County are also being treated. New Mexico officials have added traps, issued wound-inspection guidance, and launched a one-stop reporting website.
Conflicting Reports & Gaps
USDA cites five confirmed cases while state officials list four, creating a discrepancy. The dog’s recent travel history is unknown, leaving uncertainty about local breeding. No definitive evidence of an established wild NWS population exists in New Mexico.
Verbatim Quotes
- “This situation is evolving, and we expect new information to emerge as our investigation continues,” — Dudley Hoskins, USDA Under Secretary
- “The sooner we can determine if we, in fact, do have New World screwworm in any area of the state, the faster we can bring in the resources, the sterile flies and the veterinary stockpile products to help treat the animals,” — Jeff Witte, New Mexico Agriculture Secretary
- “We now know what the enemy looks like,” — Brooke Rollins, USDA Agriculture Secretary
- “NWS feeds on healthy, living flesh, while most other maggot species feed on dead tissue.” — Dr. Jennifer Bloodgood, Cornell University
Outlook
State and federal teams will expand trap networks, consider an official “infested zone,” and continue sterile-fly releases through July. USDA will begin distributing grant awards from the $100 million fund, while New Mexico’s reporting website serves as the central hub for updates.
