Screwworm Confirmed Screwworm larvae were identified by NVSL Saturday, March 4, from a horse in Florida. The horse and premises were treated March 3.
Mature larvae drop from the wound and pupate in the soil for approximately one week.
It takes approximately another week for the flies to become sexually mature. Based on what is currently known about the situation, USDA is not planning to release sterile flies. This decision might change as more information is obtained. There were 16 other horses in the shipment. Veterinary Services is attempting to locate these other horses.