1. Southeastern Cooperative Wildlife Disease Study, Department of Population Health, College of Veterinary Medicine, The University of Georgia, Athens, Georgia 30602, USA
2. Current address: Cornell University, College of Veterinary Medicine, S2-118 Schurman Hall, Biomedical Sciences, Ithaca, New York 14853, USA
3. Southeast Poultry Research Laboratory, Agricultural Research Service, US Department of Agriculture, Athens, Georgia 30605, USA
4. US Department of Agriculture, Animal and Plant Health Inspection Service, National Veterinary Services Laboratories, Ames, Iowa 50010, USA
5. Endangered and Nongame Species Program, New Jersey Division of Fish and Wildlife, PO Box 400, Trenton, New Jersey 08625, USA
6. Current address: Conserve Wildlife Foundation, 516 Farnsworth Avenue, Bordertown, New Jersey 08505, USA