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The original was posted on /r/science by /u/big-enchilada on 2025-06-02 21:07:20+00:00.

Original Title: Leprosy, primarily caused by Mycobacterium leprae, is considered a disease introduced into the Americas during European colonization. However, the recent discovery of a second pathogen causing leprosy, M. lepromatosis, mainly found in the Americas, challenges this view.