1. Canadian Wildlife Health Cooperative British Columbia, 1767 Angus Campbell Road, Abbotsford, British Columbia V3G 2M3, Canada
2. Animal Health Centre, British Columbia Ministry of Agriculture, 1767 Angus Campbell Road, Abbotsford, British Columbia V3G 2M3, Canada
3. Wildlife Program, Washington Department of Fish and Wildlife, Olympia, 1111 Washington St SE, Olympia, Washington 98501, USA
4. Department of Zoology, Marine Mammal Research Unit, University of British Columbia, 2202 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
5. Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California Davis, One Shields Avenue, Davis, California 95616, USA