1. Southeastern Cooperative Wildlife Disease Study, Department of Population Health, College of Veterinary Medicine, University of Georgia, 589 D. W. Brooks Dr., Athens, Georgia 30602, USA;
2. National Veterinary Services Laboratories, Science, Technologies and Analysis Services (STAS), Veterinary Services, Animal and Plant Health Inspection Service, US Department of Agriculture, 1920 Dayton Ave., Ames, Iowa 50010, USA;