06/04/2026
The U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) confirmed the detection of a New World screwworm (NWS) in a bovine in Zavala County, Texas. NWS is a serious pest that affects livestock, pets, wildlife, and less commonly, people and birds. NWS larvae (maggots) burrow into the flesh of living animals, causing serious damage to livestock and economic losses.
The affected animal is a 3-week-old calf and larvae were identified in its umbilical area. Please use the links in comments to learn more.
The action plan includes:
Forming a unified Incident Command Team with the Texas Animal Health Commission and deploying response personnel to the area;
Establishing a 20 km infested zone around the detection and implementing quarantines, movement controls, and surveillance in this area;
Expediting targeted release of sterile NWS flies by immediately deploying ground release chambers in the area, in addition to the 4 million sterile flies per week already being released aerially in the area;
Increasing trapping for NWS flies along the border and just outside of the dispersal area;
Implementing NWS surveillance and management strategies in wildlife; and
Conducting targeted outreach in the local area.
*If you suspect a case of New World Screwworm in North Carolina
call NCDA&CS Veterinary Division at (919) 707-3250