1. Department of Veterinary Microbiology, Graduate School of Agricultural and Life Sciences; The University of Tokyo; Bunkyo-ku Tokyo 113-8657 Japan
2. Laboratory of Clinical Microbiology; Kyoritsu Shoji Co.; Chiyoda-ku Tokyo 102-0073 Japan
3. Department of Veterinary Microbiology, Faculty of Agriculture; Kagoshima University; Kagoshima Kagoshima 890-0065 Japan
4. Department of Veterinary Pathology, Microbiology, and Infectious Diseases, Faculty of Animal and Veterinary Sciences; Hanoi Agricultural University; Gialam Hanoi Vietnam