USDA Confirms 3 New Texas Screwworm Cases, Pushing U.S. Total to 15
Updated
Updated · Reuters · Jun 22
USDA Confirms 3 New Texas Screwworm Cases, Pushing U.S. Total to 15
3 articles · Updated · Reuters · Jun 22
Summary
Three animals — one lamb in Crockett County and two calves in Edwards County — tested positive in the past 24 hours, lifting the U.S. screwworm count to 15.
The new detections come less than three weeks after the first domestic infestation in 60 years was found in a Texas calf, signaling the parasite's continued spread after advancing north through Mexico.
USDA said it is intensifying eradication in affected areas by releasing tens of millions of sterile flies to disrupt reproduction, while a new U.S. production facility begun in April will not open until late 2027.
Texas ranchers have warned a broader outbreak could inflict $1.8 billion in damage, as the flesh-eating pest threatens livestock, wildlife, pets and, in rare cases, people.
How vulnerable is the U.S. food supply to a single flesh-eating parasite?
Are genetically altered flies our last best hope against this returning plague?
Why did our 60-year defense against a flesh-eating parasite suddenly fail?
Screwworm Returns: The 2026 U.S. Outbreak, Economic Fallout, and the Race to Eradicate
Overview
The New World screwworm has re-emerged as a serious threat, last updated in June 2026. This parasite, known for infesting warm-blooded animals, enters through open wounds and its maggots feed on living flesh, causing severe damage and discomfort. The report highlights the importance of vigilance among residents to inspect pets and livestock for signs of infestation, such as draining wounds or visible larvae. Immediate detection and reporting are crucial to prevent further spread. The situation recalls the screwworm’s historical impact on livestock, emphasizing the need for rapid response and coordinated action to protect animal and public health.