New World Screwworm Detected in US Wildlife for First Time in Decades
The USDA has confirmed the first case of New World screwworm in wildlife in Texas, heightening concerns among ranchers and wildlife officials.
PECOS COUNTY, TEXAS, Oct 22: The U.S. Department of Agriculture (USDA) confirmed the detection of the New World screwworm in an elk in Pecos County, Texas, marking the first instance of this flesh-eating parasite in U.S. wildlife in decades. The elk was harvested by a hunter, leading to its examination.
Following this discovery, the Texas Animal Health Commission announced modifications to an existing infested zone. The USDA, in collaboration with the Texas Parks and Wildlife Department, is enhancing wildlife surveillance efforts in the area. “We encourage all hunters and landowners to be vigilant for signs of New World screwworm while they are out in the field this season,” stated Alan Cain, director of the Texas Wildlife Division.
Once eradicated from the U.S., the screwworm has re-emerged, spreading from Central America through Mexico. The U.S. had previously barred cattle imports from Mexico for over a year to prevent the pest’s entrance. However, this ban was lifted for trade at an Arizona port in August as part of a gradual reopening plan. Texas experienced an uptick in screwworm cases this summer, with the USDA reporting over 50 confirmed instances in Texas and New Mexico combined.
In New Mexico, a recent case involved a beef cow in Otero County, marking the fifth case in the state. Other reported cases included a dog in Lea County and two horses and a calf in Grant County. The USDA has established infested zones around each location, mandating inspections and treatment for animals being moved in or out.
New Mexico Agriculture Secretary Jeff Witte emphasized the importance of ongoing vigilance, stating, “This is a critical time as we move toward cooler weather. Strong surveillance and continued coordination will help us detect new cases early.”
In response to the outbreak, Rear Adm. Michael Schmoyer is leading coordinated efforts among various federal and state agencies to combat the screwworm infestation. The initiative has involved widespread inspections and surveillance from June onward, including over 70,000 wildlife observations in Texas. Schmoyer noted the significance of producer engagement, stating, “One of the reasons why this response is as effective as it is right now is because of the producers.”
Officials urge animal owners to watch for signs of infestation, including non-healing wounds and unusual irritations. Anyone suspecting an infestation should contact their local livestock board and avoid relocating affected animals.
