1. Canadian Co-operative Wildlife Health Centre, Ontario Region, Department of Pathology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 2W1
2. Wildlife Research Branch, Ontario Ministry of Natural Resources, P.O. Box 5000, Maple, Ontario, Canada L6A1S9
3. Department of Veterinary Microbiology and Immunology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 2W1