1. Southeastern Cooperative Wildlife Disease Study, Department of Population Health, College of Veterinary Medicine, The University of Georgia, Athens, GA 30602, USA
2. Southeast Poultry Research Laboratory, USDA-ARS, 934 College Station Road, Athens, GA 30605, USA
3. National Veterinary Services Laboratories, Veterinary Services, Animal and Plant Health Inspection Service, USDA, Ames, IA50010, USA
4. Texas Parks and Wildlife Department, 1120 Hodges Lane, Wharton, Texas 77488, USA
5. Current address: Texas Parks and Wldlife Department, 33948 Texas Highway 77, Omaha, TX 75571, USA
6. Current address: Texas Parks and Wldlife Department, P.O. Box 487, El Campo, TX 77437, USA