USDA rushes screwworm controls as U.S. animal cases reach six
USDA and CDC are responding to six confirmed New World screwworm cases in U.S. animals, with detections in Texas and New Mexico and sterile fly releases underway.
USDA has confirmed a growing cluster of New World screwworm cases in U.S. animals, and the response is moving quickly. Federal officials say the pest has been detected in Texas and New Mexico, and USDA has moved into containment mode with surveillance, animal movement controls, outreach, and sterile fly releases meant to slow spread.
Why this matters
New World screwworm is a parasitic fly larva that feeds on living tissue. It can affect cattle, pets, wildlife, and, in rare cases, people. For ranchers and pet owners, the concern is not just the animal-health problem itself. An outbreak can mean more inspections, tighter movement rules, added treatment costs, and more pressure on producers already working with thin margins.
USDA says the current U.S. animal cases include detections in Texas and New Mexico, and the agency has said the total reached six confirmed cases in June updates. That puts the response squarely in containment mode, not eradication mode.
How the federal response is working
The control effort centers on sterile insect technique, the same approach that helped eliminate screwworm from the United States decades ago. USDA says it has activated sterile fly dispersal operations along with trapping, testing, and movement restrictions in affected areas.
USDA and state partners are also coordinating field response work around the detection zones. The goal is to keep the pest from gaining a foothold that could increase costs for ranchers, veterinarians, transporters, and animal owners if the detections spread farther.
What CDC says about people
The CDC says no locally acquired human infestations have been reported in the United States and that the immediate risk to people remains low. Even so, the agency is coordinating with USDA and other partners because human infection is possible in rare circumstances if wounds are exposed and not treated.
USDA says animal owners should watch for draining or enlarging wounds, maggots or egg masses, signs of discomfort, and lesions around the nose, ears, genital area, or umbilical area. Anyone who suspects an infestation should contact a veterinarian or state animal health official right away.
What to watch next: more USDA and CDC updates, any new detections in Texas or New Mexico, and whether the sterile fly program is enough to keep the outbreak from expanding beyond the current response zone.
