1. Laboratory of Veterinary Pathology, Faculty of Agriculture, University of Miyazaki, Nishi 1-1, Gakuen-Kibana, Miyazaki 889-2192, Japan
2. Present address: Laboratory of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
3. Laboratory of Veterinary Microbiology, Faculty of Agriculture, University of Miyazaki, Nishi 1-1, Gakuen-Kibana, Miyazaki 889-2192, Japan
4. Departments of Science Education, Faculty of Agriculture, University of Miyazaki, Nishi 1-1, Gakuen-Kibana, Miyazaki 889-2192, Japan
5. NPO Miyazaki Cetacean Research Group, Higashi 2-22-1, Ikimedai, Miyazaki 880-0942, Japan