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11h ago

Screwworm Confirmed in Northern Mexico Less Than 70 Miles From Texas

Extensive U.S. border surveillance has found no detections to date.

Cattle feed at a ranch that exports livestock to the U.S., in Zamora, northern Mexico. (AP Photo/Fernando Llano, File)
The NWS, eradicated from the U.S. since 1966, has recently been detected in Mexico, prompting the suspension of live cattle, horse, and bison imports through U.S. ports of entry along the southern border. Larvae cause severe and often fatal damage. (USDA)
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Overview

  • Mexico’s agriculture ministry confirmed New World screwworm in an 8‑month‑old cow at a feedlot in Sabinas Hidalgo, Nuevo León, after the animal was moved from a southern outbreak zone.
  • The case is the northernmost detected in Mexico and sits near the busy Monterrey–Laredo corridor leading to Texas.
  • U.S. ports remain closed to Mexican imports of cattle, bison, and horses as part of measures to prevent the parasite from entering domestic herds.
  • Authorities report nearly 8,000 traps operating across Texas, Arizona, and New Mexico and about 13,000 screening samples with no screwworm found so far.
  • USDA continues sterile‑fly control efforts and has announced nearly $30 million to renovate a production facility near the Mexico–Guatemala border and build a dispersal facility in Texas, while Texas officials urge pesticide baiting and routine animal checks.