1. Moji Branch Shinmoji Quarantine Facility, Animal Quarantine Service, MAFF, Fukuoka, Japan
2. Microbiological Examination Division, Laboratory Department, Animal Quarantine Service, MAFF, Kanagawa, Japan
3. Pathological and Physiochemical Examination Division, Laboratory Department, Animal Quarantine Service, MAFF, Kanagawa, Japan
4. Microbiology Division, Equine Research Institute, Japan Racing Association, Tochigi, Japan