2) Kobayashi, Y., Tachibana, N., Matsumoto, I., Oyama, T. & Kageyama, T.: Isolation of very low virulent strain of Rickettsia tsutsugamushi by the use of cyclophosphamide-treated mice. Rickettsia and Rickettsial Diseases, Proc. 2nd Intl. Symposium of Rickettsia and Rickettsial Disease, Publishing House of the Slovak Acad. Sci. Blatis Lava, 1978, p.181-188.
3) Tamura, A., Takahashi, K., Tsuruhara, T., Urakami, H., Miyamura, S., Sekikawa, H., Kenmotsu, M., Shibata, M., Abe, S. & Nezu, H.: Isolation of Rickettsia tsutsugamushi antigenically different from Kato, karp, and Gilliam strains from patients. Microbiol. Immkunol., 28: 873-882, 1984.
4) Yamamoto, S., Kawabata, N., Tamura, A., Urakami, H., Ohashi, N., Murata, M., Yoshida, Y. & Kawamura, A. Jr.: Immunological properties of Rickettsia tsutsugamushi, Kawasaki strain, isolated from a patient in kyushu. Microbiol. Immunol., 30: 611-620, 1986.