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Mexico Boosts Controls on Cattle After New Screwworm Case Found Near US Border

The USDA is responding to the New World screwworm detected near the border with expanded surveillance and sterile fly dispersal, with nearly 8,000 traps monitored in U.S. border states.

  • A new case of New World screwworm has been confirmed in Sabinas Hidalgo, Nuevo Leon, Mexico, only 70 miles from the U.S. border, according to Mexico's National Service of Agro-Alimentary Health, Safety, and Quality and the U.S. Department of Agriculture.
  • The flesh-eating screwworm parasite has advanced into the U.S., prompting high alert in the U.S. cattle industry, according to the U.S. Department of Agriculture.
  • Mexico activated emergency controls after detecting this new case, marking the closest outbreak to the U.S. border since it began last year.
  • In response, the U.S. government has kept its border mostly closed to Mexican cattle since May and plans to suspend imports of Mexican cattle, bison, and horses.
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U.S. News broke the news in New York, United States on Sunday, September 21, 2025.
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