Besides Terrell County, the active cases are in Sutton, Starr, and Brewster counties, the last with two. Because of the detection, Texas established a new infested zone in which warm-blooded animals cannot leave the area without inspection by someone certified through the Texas Animal Health Commission. A detection in sheep in Terrell County triggered a new Texas infested zone with movement restrictions, and the national count reached 45 detections with only five still active. USDA says screwworm infests living animals rather than meat or produce, and inspection systems keep infested animals out of the food supply. In Texas, the Texas Animal Health Commission at 1-800-550-8242.