Courtesy: Canva, SDSU Extension News
The U.S. Department of Agriculture said on Sunday that Mexico’s National Service of Agro-Alimentary Health, Safety, and Quality (SENASICA) confirmed a new case of New World screwworm in Sabinas Hidalgo, located in the state of Nuevo León, less than 70 miles from the U.S.-Mexico border.
This is now the northernmost detection of NWS during this outbreak, and the one most threatening to the American cattle and livestock industry. Sabinas Hidalgo is located near the major highway from Monterrey, Nuevo Leon, to Laredo, Texas, which is one of the most heavily trafficked commercial thoroughfares in the world.
“Protecting the United States from NWS is non-negotiable and a top priority of the Trump Administration,” said U.S. Secretary of Agriculture Brooke L. Rollins. “This is a national security priority.”
The previous northernmost detection was reported on July 9, 2025, in Veracruz, approximately 370 miles farther south. Preliminary reports from SENASICA indicate that the affected animal—an 8-month-old cow—had recently been moved to a certified feedlot in Nuevo León from a region in southern Mexico with known active NWS cases.
Currently, U.S. ports remain closed to imports of cattle, bison, and horses from Mexico.
Since July, USDA alongside Mexico, has been actively monitoring nearly 8,000 traps across Texas, Arizona, and New Mexico. To date, more than 13,000 screening samples have been submitted, with no NWS flies detected. USDA is analyzing all new information related to the recent case in Nuevo León and will pursue all options to release sterile flies in this region as necessary.
USDA
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