1. Canadian Cooperative Wildlife Health Centre, Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon SK S7N 5B4, Canada
2. Canadian Food Inspection Agency, Animal Diseases Research Institute, Virology Section, 3851 Fallowfield Road, P.O. Box 11300, Station H, Nepean, Ontario K2H 8P9, Canada