1. Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada
2. Smith Falls Veterinary Services, 250 Lombard Street, Smith Falls, ON K7A 5B8, Canada
3. Department of Biomedical Science, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada