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Sooty mangabeys can also contract leprosy, caused by the bacterium "Mycobacterium leprae". It is one of several species in which naturally acquired leprosy has been reported, the others being humans, the nine-banded armadillo, the common chimpanzee, and the crab-eating macaque; murine leprosy has also been reported in rats and mice, caused by "Mycobacerium lepraemurium."