science
Who really found the leprosy bacteria? A closer look at old claims
May 13, 2026
Back in the 1800s, two scientists named Hansen and Neisser both studied leprosy. Hansen published findings first, naming the bacteria Mycobacterium leprae. Neisser followed a year later, but never said Hansen was wrong or ignored his work. Yet over time, a story grew that Neisser tried to take credi
