The New World screwworm (NWS), a destructive parasite that can infest livestock and wildlife by laying eggs in open wounds, is again making headlines as the current outbreak in Mexico and parts of Central America continues to push north. The screwworm fly is not present in the United States, according to both USDA and CDC, but officials have repeatedly emphasized that vigilance is critical because of the speed and severity of infestations once the pest is established.
The latest “how close is it?” update
A widely circulated June 1, 2026 press release from Texas State Representative Don McLaughlin (District 80) states he received reports that NWS has been detected “one mile from the Texas border” and calls for an emergency response.
However, USDA publicly disputed the “one mile” claim, stating that there was no confirmed case within one mile of the border.
As for the closest confirmed detections reflected in major news coverage: Reuters reported May 29, 2026 that USDA said NWS was detected in a young sheep in Coahuila, Mexico, about 31 miles (50 km) from the U.S. border—described as the closest confirmed case cited in that report.
What officials say NWS does (and why it’s taken so seriously)
NWS is not a typical fly strike problem. In the Texas House press release you provided, it’s described as a pest that attacks living animals by laying eggs in open wounds; after hatching, larvae can cause severe injury, infection, and death if not treated. This aligns with public health and federal animal-health descriptions of NWS risk in the outbreak region, where infestations have been documented in animals and (more rarely) people.
What Texas leaders are being asked to do
In the June 1 release, Rep. McLaughlin calls for a Texas-led emergency response and lists requested actions including:
- Establish a statewide New World Screwworm Task Force
- Deploy state personnel and resources to South Texas
- Create enhanced livestock and animal inspection operations along the border
- Increase surveillance and detection efforts in border counties
- Develop emergency response protocols for a potential outbreak
- Accelerate deployment of sterile insect eradication technology
- Coordinate with private-sector partners and ranchers on rapid-response efforts
What the federal response looks like right now
USDA APHIS maintains a public “current status” page tracking the situation and linking out to Mexico’s SENASICA updates and COPEG information.
USDA also announced earlier this year that it was shifting sterile fly dispersal efforts to reinforce coverage along the U.S.–Mexico border, describing a large-scale sterile insect strategy designed to stop northward spread.
On the Texas side, the Texas Animal Health Commission (TAHC) has created a dedicated NWS information hub that compiles state and federal updates and guidance.
What this means for horse owners, cattle producers, and livestock managers
While much of the public conversation focuses on cattle, any warm-blooded animal with an open wound can be at risk in an affected region—particularly animals with recent injuries, surgical sites, umbilical stumps on newborns, or wounds that can be hard to see.
Practical takeaways, especially for anyone hauling or buying across regions:
- Inspect animals daily for wounds, and treat and monitor any open area closely.
- Pay extra attention to newborns, post-procedure animals, and any animal with skin breaks.
- If travelling or purchasing from outbreak-adjacent areas, ask about biosecurity and monitoring protocols and keep clear records.
- Follow state and federal advisories for reporting pathways and movement restrictions, especially as outbreak geography changes.
Bottom line
There is a difference right now between what is confirmed and what is circulating. The attached Texas House press release reflects growing urgency among Texas leaders, but USDA has publicly stated that the “one mile from the border” claim is not confirmed, and the closest distance widely reported from USDA-related information in major media coverage is 31 miles (Coahuila, Mexico).
What is not in dispute is the core risk: the screwworm is a high-impact livestock pest, and both state and federal agencies are actively messaging preparedness and prevention while emphasizing that the U.S. currently has no NWS cases.
Sources
- USDA APHIS – Current Status: https://www.aphis.usda.gov/animalsanimal-health/livestock-and-poultry-disease/stop-screwworm/current-status
- USDA APHIS – Sterile fly dispersal announcement: https://www.aphis.usda.gov/news/agency-announcements/usda-shifts-sterile-fly-dispersal-efforts-defend-us-border
- CDC – New World Screwworm situation summary: https://www.cdc.gov/new-world-screwworm/situation-summary/index.html
- Reuters (May 29, 2026) – Detection about 31 miles from U.S. border (Coahuila): https://www.reuters.com/business/healthcare-pharmaceuticals/flesh-eating-screwworm-found-within-31-miles-us-border-says-usda-2026-05-29/
- Texas Animal Health Commission – NWS hub: https://www.tahc.texas.gov/emergency/nws.html
- USDA statement disputing “one mile” claim (social post): https://x.com/USDA/status/2061612189287354459
