The number of turkeys killed at South Dakota farms in response to recent detections of avian influenza has risen to 419,650, continuing the state’s status as the national epicenter of this season’s outbreak. ADVERTISEMENTMeanwhile, South Dakota State Veterinarian Beth Thompson said blue-winged teal, a species of duck, have been identified as carriers of this season’s virus. Sept. 11: Commercial turkey meat bird in Jerauld County, 44,500 birds affected, poultry in Spink County, 750 birds affected. Sept. 2: Commercial turkey meat bird in Beadle County, 52,600 birds affected. Aug. 28: Commercial turkey meat bird in Faulk County, 55,400 birds affected.