The 1873 discovery of Mycobacterium leprae, the causative agent of leprosy by Norwegian doctor Gerhard Armauer Hansen, remains one of the greatest paradigm shifts in medical history, a true revolution.
In 1974, Yohei Sasakawa accompanied his father to a leprosy hospital he had funded. He saw leprosy patients inside the hospital still and expressionless. The smell of leprosy filled the air, the smell of pus from open sores.