USDA Reclassifies New World Screwworm Dog Case as First in New Mexico

WASHINGTON, D.C. — The U.S. Department of Agriculture has reclassified a New World Screwworm case in a dog — previously reported in Andrews County, Texas — as the first confirmed case in New Mexico, in Lea County. 

The dog resides in a Lea County, New Mexico, household, though the case was initially reported by a Texas veterinarian, USDA’s Animal and Plant Health Inspection Service said Monday. Officials believe it is an isolated case. Because the dog’s recent travel and exposure history remain unknown, USDA and state partners have begun inspecting additional animals in the home, increased outreach in the area and are continuing to investigate the animal’s movement history.

“This situation is evolving, and we expect new information to emerge as our investigation continues,” said Dudley Hoskins, Under Secretary for Marketing and Regulatory Programs. “USDA is committed to sharing what we learn quickly, accurately, and transparently so animal owners and local communities have the information they need to stay vigilant. We are working closely with our partners in New Mexico, Texas, and across the region to ensure we identify, contain, and respond to any potential cases as swiftly as possible.”

New World Screwworm poses a serious threat to livestock, pets, wildlife and, in rare cases, people. The larvae feed on living tissue and can cause severe wounds, animal suffering and significant economic harm if not detected and treated quickly. 

In addition to the reclassified New Mexico case, USDA confirmed a fourth case in Texas involving a goat in Gillespie County. The Texas Animal Health Commission and USDA are working to gather additional details, establish surveillance and testing in the area, and share outreach materials.

APHIS and New Mexico officials are implementing the NWS Response Playbook, which includes continuing the epidemiological investigation, sampling additional animals, fly trapping, preparing for sterile insect release if needed, and conducting outreach to encourage reporting of suspect cases. 

Veterinarians urge animal owners to watch for wounds that worsen instead of heal, foul-smelling or draining wounds, visible maggots, and excessive licking, biting or irritation around injuries. Livestock producers should closely inspect newborn animals and fresh wounds. Anyone suspecting an infestation should contact a veterinarian immediately.