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  • Title: Presumptive treatment of multidrug-resistant tuberculosis in household contacts.
    Author: Parr JB, Rich ML, Keshavjee S, Franke MF, Mitnick CD, Bayona J, Becerra MC.
    Journal: Int J Tuberc Lung Dis; 2016 Mar; 20(3):370-5. PubMed ID: 27046719.
    Abstract:
    SETTING: Multidrug-resistant tuberculosis (MDR-TB) is a growing global health threat that often requires presumptive treatment in the absence of drug susceptibility testing (DST) results. OBJECTIVE: To compare two approaches to the treatment of MDR-TB contacts with no DST results who develop TB disease. DESIGN: We conducted a retrospective cohort study of adults treated for TB disease who were contacts of patients living with MDR-TB. Subjects had been treated according to one of two presumptive treatment strategies: 1) regimens containing exclusively first-line drugs, and 2) regimens that included both first- and second-line drugs that were adjusted if and when DST results became available. The primary endpoint was a composite of death and treatment failure. RESULTS: Household contacts of MDR-TB patients who developed TB disease and were treated with first-line regimens were significantly more likely to experience unfavorable end-of-treatment outcomes than those treated with presumptive MDR-TB regimens (RR 2.88, 95%CI 1.24-6.68). CONCLUSION: Household contacts of MDR-TB patients who develop TB disease but have no DST results should receive regimens containing second-line drugs selected based on the infecting strain of the index patient. Regimens containing only first-line anti-tuberculosis drugs significantly increase the risk of unfavorable outcomes.
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