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Intradermal immunization with killed Mycobacterium leprae renders mice immune to infection with viable M. leprae. This protection is long lasting and systemic in that immunization in the left flank results in protection in both the left and right footpads. Immunization with Mycobacterium vaccae was ineffective in protecting mice against M. leprae infection, while Mycobacterium bovis BCG provided partial protection. Mycobacterium habana TMC 5135 (now known as Mycobacterium simiae) was found to be as effective as M. leprae in protecting mice against footpad infection.
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Singh et al. (1989) studied this question.
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