No infected wildlife carcasses have been reported between the U.S.-Mexico border and the two confirmed New World Screwworm cases in Zavala County, Texas calves, roughly 50–60 miles north.
While officials attribute the jump to natural dispersal, the absence of any intermediate detections—despite active surveillance, traps, and sterile-fly buffers—makes an undetected leap by a fly that normally travels only a few miles highly improbable, strongly fueling suspicions of intentional mischief, such as deliberate transport or release of infested material aimed at disrupting U.S. cattle operations. Aggressive genetic tracing of the Texas strain is essential to determine whether this was sabotage or coincidence.