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Wednesday, June 17, 2026 at 1:30 PM

New World screwworm reaches Texas, US

Doctor shares insight about surveillance, response strategies to contain parasite
New World screwworm reaches Texas, US
The New World screwworm is a parasitic fly that targets cattle and other livestock.

Author: Jose 'JJ' Balderas

With new cases of New World screwworm confirmed in a dog in Lea County, New Mexico and a goat in Gillespie County Monday, June 8, USDA officials are emphasizing the need for ongoing surveillance and reporting as the United States works to contain the rapidly spreading parasite.

For those unfamiliar with NWS, it is a parasitic fly that only feeds on living tissue of warm-blooded animals, laying eggs in open wounds or mucus membranes. If left untreated, an animal can succumb to the infestation within seven to 14 days.

Dr. Bain Wilson, rancher education and outreach manager for Ranchbot Monitoring Solutions, said the speed at which the larvae develop makes routine animal inspections critical.

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