1. Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada.
2. USDA, Agricultural Research Service, US National Parasite Collection and Animal Parasitic Disease Laboratory, BARC East 1180, 10300 Baltimore Avenue, Beltsville, MD 20705, USA.
3. Alberta Provincial Laboratory for Public Health (Microbiology), 3030 Hospital Drive, Calgary, AB T2N 4W4, Canada.
4. Environment Canada, Canadian Wildlife Service, 115 Perimeter Rd, Saskatoon, SK S7N 0X4, Canada.
5. Alaska Department of Fish and Game, Division of Wildlife Conservation, 1300 College Road, Fairbanks, AK 99701, USA.