Ryukichi Inada (稲田 龍吉, Inada Ryūkichi; March 18, 1874 – February 27, 1950) was a Japanese physician, prominent academic, and bacteriologist researcher. He discovered the Weil's disease pathogen. In addition to his life's work in early 20th-century Japanese medical education, he was a pioneer in Japanese clinical cardiology and oncology.
Source: “Ryukichi Inada”, English Wikipedia (CC BY-SA 4.0), excerpt