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Hayazo Ito

Born  1865

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Japanese surgeon, born May 1865, Inaba, Tottori.

Biography of Hayazo Ito

Hayazo Ito studied at the Imperial University in Tokyo, graduating in 1889, Igaku Hakushi 1900, in 1891 he established the private hospital in Tottori and in 1893 became director of the Yonago hospitals, in 1894 of the Sapporo hospitals. From 1896 to 1899 he undertook further education in Germany and Switzerland, particularly in surgery, and on his return to Japan in 1900 assumed the chair of surgery at the Imperial University in Kyoto. Ito retired in 1921. He published numerous works in the fields of surgery and orthopaedics, both in German and Japanese.

We thank Søren Nørby, Denmark, for information submitted.


  • Inada Ryukuchi (1874–1950), Y. Ido, R. Hoki, R. Kaneko, and Hayozo Ito:
    The etiology, mode of infection, and specific therapy of Weil's disease (Spirochaetosis icterohaemorrhagica).
    Journal of Experimental Medicine, Baltimore, 1916, 23: 377–402.
    Preliminary report (in Japanese) in Tokyo Ijishinshi, 1915, No. 1908.
    The authors proved that Sp. (leptospira icterohaemorrhagica is the causal organism in Weil's disease.
  • Ido Yutaka (1881–1919), R. Hoki, H. Ito, and H. Wani:
    The rat as carrier of Spirochaeta icterohaemorrhagica, the causative agent in Weil's disease (Spirochaetosis icterohaemorrhagica).
    Journal of Experimental Medicine, Baltimore, 1917, 26: 341–353.
    Rats shown to be the carriers of Leptospira.
  • Ido Yutaka, H. Ito, and H. Wani:
    Spirochaeta hebdomadis, the causative agent of seven-day fever (nanukayami).
    Journal of Experimental Medicine, Baltimore, 1918, 28: 435–448.
    Discovery of Leptospira hebdomadis, carried by a mouse.

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