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Leprosy requires prolonged treatment with multiple drugs associated with severe adverse effects. Are there safer alternatives? In an open-label, manufacturer-supported proof-of-concept study in Brazil, investigators assessed an 8-week course of oral bedaquiline (given at a lower dose than that used for drug-resistant tuberculosis) in persons with untreated multibacillary leprosy. Bedaquiline was followed by standard WHO multidrug therapy for leprosy; patients were followed for 112 weeks. Response to therapy was assessed by the growth of Mycobacterium leprae in footpads of mice inoculated with samples from participants' skin lesions. The authors also explored another way to assess treatment response by using quantitative reverse-transcriptas…