1. Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium
2. Calgary Laboratory Services and Cummings School of Medicine, University of Calgary, 3330 Hospital Drive Northwest, Calgary, Alberta AB T2N 4N1, Canada
3. The Marine Mammal Center, 2000 Bunker Road, Sausalito, California 94965, USA