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USDA Investigates Possible New World Screwworm Case in South Texas

USDA says the calf was found with larvae in its umbilical area, and officials have set a quarantine zone and begun sterile-fly releases.

  • On Wednesday, Agriculture Secretary Brooke Rollins confirmed the first New World screwworm case in Texas since 1966, identified in a 3-week-old calf in LaPryor approximately 50 miles from the Mexican border, threatening the state's $15 billion cattle industry.
  • The parasite's larvae feed on living tissue, posing a significant threat to livestock. USDA officials monitored the pest's rapid movement across Mexico for over a year, attempting to prevent its entry into the United States.
  • Texas State Veterinarian Bud Dinges established a 12-mile quarantine zone prohibiting warm-blooded animals from moving without inspection. The USDA began releasing sterile flies and started construction on a $750 million breeding facility in the region.
  • Criticizing the federal response as too slow, Texas Agriculture Commissioner Sid Miller urged President Donald Trump to deploy every available resource before the outbreak becomes a full-blown agricultural disaster.
  • Officials tested over 58,000 fly samples and 19,000 wild animals to monitor spread. Rollins stated, "There is no threat of mass infestation," while the USDA deploys 8,000 fly traps along the U.S.-Mexico border.
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The Toronto StarThe Toronto Star
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What to know about the New World screwworm fly and its reappearance in the US

The New World screwworm fly is threatening the $113 billion U.S. cattle industry for the first time in more than a half century, with an infestation from its flesh-eating larvae

·Toronto, Canada
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Houston Public Media broke the news in Houston, United States on Wednesday, June 3, 2026.
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