[1] OSAKA UNIV, DENT SCH, DEPT MICROBIOL, KITA 40, OSAKA, JAPAN
[2] UNIV TOKYO, FAC MED, DEPT MICROBIOL, BUNKYO, TOKYO, JAPAN
[3] SHIZUOKA COLL PHARM, DEPT MICROB, SHIZUOKA, JAPAN
[4] GIFU UNIV, SCH MED, DEPT BIOCHEM, TSUKASAMACHI, GIFU, JAPAN
[5] TONEYAMA HOSP, NATL SANAT, RES INST TUBERCULOSIS, TOYONAKA, OSAKA, JAPAN
[6] OSAKA UNIV, RES INST MICROBIAL DIS, DEPT PROTOZOOL, Suita, Osaka, JAPAN
[7] OSAKA UNIV, INST SCI & IND RES, DEPT APPL BIOCHEM, SUITA, OSAKA, JAPAN
[8] TOKUSHIMA UNIV, SCH MED, DEPT BACTERIOL, KURAMOTO, TOKUSHIMA, JAPAN