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Screwworms in Texas: What an Infestation Means for Livestock, Beef Supply and the Economy
The infection was found about 5.6 miles from the first case, and the USDA is urging ranchers to inspect animals for wounds and maggots.
On Friday, the U.S. Department of Agriculture confirmed a second case of New World screwworm in a one-month-old calf in Zavala County, Texas, approximately 5.6 miles from the first detected case.
Spread by flies that lay eggs in exposed flesh, New World screwworm was eradicated in the 1960s before re-emerging from Central America in 2025, according to the USDA.
Just 24 hours after discovering the first case in a three-week-old calf, the USDA implemented trapping and quarantine zones to prevent further infestation spread.
Regarding the response, the agency stated, "We have defeated this pest before, and we will do it again," emphasizing that livestock producers have "USDA's FULL support."
Officials now monitor for additional cases and encourage Texas owners to inspect livestock for wounds, as the pest poses significant potential economic risks to the region.