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OBJECTIVES. The goals were to describe the management of multidrug-resistant tuberculosis among children, to examine the tolerability of second-line antituberculosis agents among children, and to report the outcomes of children treated for multidrug-resistant tuberculosis in poor urban communities in Lima, Peru, a city with high tuberculosis prevalence. METHODS. A retrospective analysis of data for 38 children < 15 years of age with multidrug-resistant tuberculosis, either documented with drug sensitivity testing of the child&apos;s tuberculosis isolate or suspected on the basis of the presence of clinical symptoms for a child with a household contact with documented multidrug-resistant tuberculosis, was performed. All 38 children initiated a supervised individualized treatment regimen for multidrug-resistant tuberculosis between July 1999 and July 2003. Each child received 18 to 24 months of therapy with [greater than or equal to] 5 first- or second-line drugs to which their Mycobacterium tuberculosis strain was presumed to be sensitive. RESULTS. Forty-five percent of the children had malnutrition or anemia at the time of diagnosis, 29% had severe radiographic findings (defined as bilateral or cavitary disease), and 13% had extrapulmonary disease. Forty-five percent of the children were hospitalized initially because of the severity of illness. Adverse events were observed for 42% of the children, but no events required suspension of therapy for >5 days. Ninety-five percent of the children (36 of 38 children) achieved cures or probable cures, 1 child (2.5%) died, and 1 child (2.5%) defaulted from therapy. CONCLUSIONS. Multidrug-resistant tuberculosis disease among children can be treated successfully in resource-poor settings. Treatment is well tolerated by children, and severe adverse events with second-line agents are rare. Key Words tuberculosis, multidrug resistance, international child health Abbreviations MDR-TB--multidrug-resistant tuberculosis DST--drug susceptibility testing ITR--individualized treatment regimen NTP--National Tuberculosis Program DOTS--directly observed therapy, short course, DESPITE AGGRESSIVE INTERNATIONAL efforts, tuberculosis remains a leading infectious cause of death, with an estimated 8.8 million incident cases per year. (1) In 2000, an estimated 884 000 (10.7%) of [...]