Of the following species of mycobacterium, which causes a chronic disease of the skin, mucous membranes, and nerve tissue and has not yet been cultivated in vitro?

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Leprosy is both a bacterial and immunologic disease. Based on the host's response, the spectrum of disease caused by M. leprae ranges from subclinical infection to intermediate stages of disease to full-blown and serious clinical manifestations involving the skin, upper respiratory system, testes, and peripheral nerves. The two major forms of the disease are a localized form called tuberculoid leprosy and a more disseminated form called lepromatous leprosy.

Of the Following Species of Mycobacterium, Which Causes a Chronic