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Mexico confirms new screwworm case in northern border state Nuevo Leon

The isolated screwworm case in Nuevo Leon was controlled with mandatory treatments, part of 6,703 cases reported since last November, prompting ongoing border cattle import restrictions.

  • On Monday, Mexico's agriculture ministry said another case of the flesh-eating screwworm was detected in Nuevo León state and an infested calf was intercepted in Montemorelos, town south of Monterrey.
  • Since November of last year the outbreak has recorded 6,703 screwworm cases as of September 13, prompting the U.S. government to keep its border mostly closed to Mexican cattle imports since May.
  • Senasica recently told sector groups ivermectin must be given 72 hours before cattle movement under supervision, and none of the other 84 animals in the same shipment were infested.
  • U.S. Agriculture Secretary Brooke Rollins said on X the case was isolated about 100 miles south, adding `We will have boots on the ground within hours to independently verify the situation,` and criticized Mexico's response.
  • Officials said the new detection was not related to a previous confirmed case in September, while confirmed cases numbered 5,086 during the period ending August 17.
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Mexico confirms new screwworm case in northern border state Nuevo Leon

Mexico's agriculture ministry said on Monday another case of the flesh-eating screwworm parasite was detected in Nuevo Leon, which borders the United States, marking the state's second confirmed case in about two weeks.

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U.S. News broke the news in New York, United States on Monday, October 6, 2025.
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