1. Department of Veterinary Pathology, Joint Faculty of Veterinary Medicine Yamaguchi University Yoshida Yamaguchi Japan
2. Ube City Tokiwa Zoo Ube Yamaguchi Japan
3. Department of Veterinary Microbiology, Joint Faculty of Veterinary Medicine Yamaguchi University Yoshida Yamaguchi Japan
4. Department of Pathology National Institute of Infectious Diseases Tokyo Japan