1. Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, One Shields Ave., University of California, Davis, California 95616, USA
2. Current address: Zoological Pathology Program, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, LUMC Bldg. 101, Rm. 0745, 2160 South First Ave., Maywood, Illinois 60153, USA
3. Sea World, San Diego, 500 Sea World Dr., San Diego, California 92109, USA
4. Animal Health Centre, British Columbia Ministry of Agriculture and Food, 1767 Angus Campbell Rd., Abbotsford, British Columbia V3G 2M3, Canada
5. William R. Pritchard Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, California 95616, USA
6. Santa Barbara Museum of Natural History, Santa Barbara, California 93105, USA
7. Wildlife Health Center–Orcas Island Office, UC Davis School of Veterinary Medicine, 942 Deer Harbor Rd., Eastsound, Washington 98245, USA