Among other things, he collaborated with Gerhard Armauer Hansen who discovered Mycobacterium leprae the causative agent of leprosy, in the investigation of the effects of leprosy in the eyes.
Its mission was to systematically eliminate leprosy, (Hansen's disease), a readily transmissable, previously incurable, chronic infectious disease caused by M. leprae, from each prefecture in Japan.
Mycobacterium tuberculosis | Mycobacterium smegmatis | Mycobacterium leprae | Mycobacterium ulcerans | Mycobacterium kansasii | Mycobacterium bovis | ''Mycobacterium avium'' complex |