1) Freter, R., and Abrams, G.D. 1972. Function of various intestinal bacteria in converting germfree mice to the normal state. Infect. Immun. 6 : 119-126.
2) Institute of Medical Science (ed) 1958. Fundamental methods in bacteriology, p. 207, Tokyo (in Japanese).
3) Maejima, K., Kiuch, Y., Morita, S., and Tajima, Y. 1970. Studies on monocontaminated mice with Escherichia coli : Serological and histological examination. Exp. Anim. 19 : 141-148 (in Japanese).
4) Maejima, K., Suzuki, K., Kobayashi, R., Sudo, K., and Itoh, K. 1973. Sterilization conditions of the autoclave equipped in the breeding section of laboratory animal center, Institute of Medical Science, University of Tokyo. Exp. Anim. 22 : 31-36 (in Japanese).
5) Margard, W.L., and Peters, A.C. 1964. A study of gnotobiotic mice monocontaminated with Salmonella typhimurium. Lab. Anim. Care 14 : 200-206.