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Reductions in tuberculosis incidence after trials of preventive therapy. In both Alaska (left) and Greenland (right), the tuberculosis incidence fell dramatically in both the isoniazid and placebo arms following the implementation of active case finding, linkage to effective treatment, and (in the isoniazid arms) preventive therapy. Reproduced from [11]. Permission to reprint this figure has been received from S. Karger AG, Medical and Scientific Publishers.
