1. California Department of Fish and Game, Marine Wildlife Veterinary Care and Research Center, 1451 Shaffer Rd. Santa Cruz, California 95060, USA
2. University of California-Davis, Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, Davis, California 95616, USA
3. William R. Pritchard Teaching Hospital, University of California-Davis, School of Veterinary Medicine, Davis, California 95616, USA
4. Monterey Bay Aquarium, 886 Cannery Row, Monterey, California 93940, USA
5. U.S. Fish and Wildlife Service, Marine Mammals Management, 1011 East Tudor Road, Anchorage, Alaska 99503, USA