1. ABE, T., TOKUNAGA, T., KANEKO, M., KOTORII, S. AND AOKI, G. (1933) : On natural reservoir of Hasaminetsu. Causative agent in the Hasami area, Nagasaki Prefecture. Nihon Densenbyo Gakkai Zasshi, 7, 565-578 (in Japanese) .
2. HIGUCHI, S. (1930) : Positive rates of Leptospira icterohaemorrhagiae in house rats trapped at various areas in Japan. Tokyo Iji-shinshi (No. 2704) 2722-2727, and (No. 2705) 2797-2802 (in Japanese) .
3. IDO, Y., HOKI, R., ITO, H. AND WANT, H. (1916) : House rats as a carrier of Leptospira icterohaemorrhagiae. Relationship between rats and mode of infection. Tokyo Iji-Shinshi (No. 1978) , 1387-1397, and (No. 1979) , 1439-1448 (in Japanese) .
4. IDO, Y., ITO, H. AND WANT, H. (1917) Relationship between field rodents and Nanukayami. Nihon Naikagaku Zasshi, 5, 274-278 (in Japanese) .
5. KITAOKA, M. (1940) : Leptospira canicola. Jikken Igaku Zasshi, 24, 861 (in Japanese) .