1. Department of Infectious Diseases; Osaka Prefectural Institute of Public Health; 1-3-69 Nakamichi Higashinari-ku Osaka-shi, Osaka 537-0025
2. Department of Bacteriology II; National Institute of Infectious Diseases; 4-7-1 Gakuen Musashimurayama-shi Tokyo 208-0011
3. Department of Microbiology; Osaka City Institute of Public Health and Environmental Sciences; 8-34 Tojo-cho Tennoji-ku Osaka-shi, Osaka 543-0026
4. Department of Pathogenetic Veterinary Sciences, United Graduate School of Veterinary Sciences; Gifu University; 1-1 Yanagido Gifu-shi Gifu 501-1193 Japan