1. Infectious Disease Laboratory; University of Tokyo; Bunkyo-ku Tokyo 113-8657 Japan
2. Department of Veterinary Microbiology; Graduate School of Agricultural and Life Sciences; University of Tokyo; Bunkyo-ku Tokyo 113-8657 Japan
3. Veterinary Microbiology Laboratory; College of Veterinary Medicine; Konkuk University; 1 Hwayangdong Kwangin-gu Seoul 143-701 Republic of Korea
4. Avian Disease Laboratory; College of Veterinary Medicine; Konkuk University; 1 Hwayangdong Kwangin-gu Seoul 143-701 Republic of Korea
5. Laboratory of Clinical Microbiology; Kyoritsu Seiyaku Corporation; Chiyoda-ku Tokyo 102-0073 Japan