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Rifampin Therapy of Lepromatous Leprosy^*

Patients with borderline-lepromatous (BL) or fully lepromatous (LL) leprosy were treated in the sanitarium for approximately 1 year with oral rifampin (600 mg daily) or with oral dapsone (100 mg daily). They were then treated as outpatients with intramuscular acedapsone (225 mg every 12 weeks) or oral dapsone (50 mg daily). They have now been followed for a total of 28 to 34 months. Death of Mycobacterium leprae during the initial 24 weeks was monitored by mouse inoculation with M. leprae from skin punch biopsy specimens. With rifampin therapy, death of M. leprae occurred rapidly, and viable M. leprae were nearly undetectable by the time the first specimen was taken after the start of treatment, at 4 weeks. With dapsone therapy, death of M. leprae was slower, and in some cases the inoculation results were still positive at 12 weeks. The therapeutic response during the period of outpatient treatment has been satisfactory. The number of dead M. leprae, as measured by the bacterial index in skin smears and the number of acid-fast bacteria in skin specimens, has continued to decrease, and clinical progress has been satisfactory. The measured drug-induced death of M. leprae occurred at about the same rate in BL patients as in LL patients. Disappearance of dead M. leprae from the tissues was much more rapid in BL patients than in LL patients.

Accepted for publication October 19, 1974.

^* Address reprint requests to Dr. Charles C. Shepard, U. S. Department of Health, Education and Welfare, Public Health Service, Center for Disease Control, Atlanta, Georgia 30333.