1. Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada, NIG 2W1
2. Southeastern Cooperative Wildlife Disease Study, University of Georgia, Athens, GA 30602
3. Pennsylvania Game Commission, Animal Diagnostic Laboratory, University Park, PA 16802
4. Department of Comparative, Diagnostic, and Population Medicine, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610