Kensuke Mitsuda
Kensuke Mitsuda published the first paper leading to the lepromin reaction. However, his original idea was to find a test which distinguishes leprosy patients from non-leprosy persons. During his study, he found that the test results differed depending on the types of leprosy. He reported it at the 3rd International Leprosy Congress in France in 1923 but it received little attention. Mitsuda stored the necessary materials in a regrigator and tried to persuade many doctors who came under him to study them, and finally he found Fumio Hayashi. The Mitsuda Test was at last completed by Fumio Hayashi.