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Hansen's disease as a research model.

M ycobacterium leprae (M. leprae), the etiologic agent of leprosy,' produces a chronic infectious disease with diverse clinical appear-ances. The variety of clinical forms is determined by the host-parasite relationship, which depends on the patient's cell mediated immune response to M. leprae. Clinical manifestations range from a single, often self-healing lesion as seen in polar tuberculoid leprosy, to a disseminated and progressive disease involving almost the entire skin and many peripheral nerves, manifested in lepromatous leprosy. Epidemiologic studies suggest that only a minority of those exposed to the infectious agent get the disease. Most probably have an effective immune response which arrests the multiplication of M. leprae at a subclinical level.