He read a paper on lepromin test at a leprosy conference in Bangkok in 1930.
In 1931 he became chief doctor in Nagashima Aiseien Sanatorium.
In 1933 made an around the world trip of leprosy hospitals and sanatoriums as an inspecting member of the League of Nations.
[1] But he regarded himself a pathologist and not an immunologist, so, he wanted other researchers of leprosy who came under him to complete it.
Hayashi read a paper on it at a leprosy conference at Bangkok.