| [characterization of rickettsia tsutsugamushi strains newly isolated in ehime prefecture, japan]. | five strains of rickettsia tsutsugamushi were isolated in ehime prefecture during december 1987 to january 1990. of these, two strains, the yamazaki and noma-3, were isolated at noma area of imabari city and three strains, the kakiwara-10, -11, -12, at kakiwara area of uwajima city. the yamazaki strain was isolated from a patient of tsutsugamushi disease and the other strains from wild rodents (apodemus speciosus). these strains showed virulence in euthymic mice. the calculated ld50 of the yamaz ... | 1992 | 1402103 |