Analysis of the genome of the leprosy bacillus uncovers evidence of extensive deletion and inactivation of genes. Secluded in a specialised niche, it has discarded much of its genetic heritage, though retaining just enough to be a major human pathogen.
Young, D., & Robertson, B. (2001, May 15). Genomics: Leprosy - A degenerative disease of the genome. Current Biology. Cell Press. https://doi.org/10.1016/S0960-9822(01)00213-5