1. Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Illinois, Urbana, Illinois, USA
2. Department of Population Medicine and Diagnostic Sciences, Animal Health Diagnostic Center, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
3. Wildlife Conservation Society, Zoological Health Program, Bronx Zoo, Bronx, New York, USA
4. National Veterinary Services Laboratories, Veterinary Services, U.S. Department of Agriculture, Ames, Iowa, USA
5. Department of Pathobiology, College of Veterinary Medicine, University of Illinois, Urbana, Illinois, USA
6. Zoological Pathology Program, Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Brookfield, Illinois, USA