The U.S. Department of Agriculture (USDA) Animal and Plant Inspection Service confirmed the detection of a New World screwworm (NWS) in Texas on June 4, 2026. The parasite was found in a young calf located in Zavala County, which is southwest of San Antonio. This is currently the only confirmed case of the screwworm in the state.
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New World Screwworm Fly Detected in Texas for First Time in Decades
The New World screwworm has been detected in Texas for the first time in decades, according to the USDA. The parasite was found in a young calf in Zavala County, with no additional cases reported at this time.
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Screwworm fly detected in Texas for first time in decades
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New World Screwworm Fly Detected in Texas for First Time in Decades
