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Published online by Cambridge University Press: 02 January 2015
Single-drug prophylaxis is recommended after tuberculin skin test conversion, but not when there is active disease on chest radiograph because resistance develops frequently. Isoniazid-resistant tuberculosis developed in a physician receiving prophylaxis despite “faint left upper lobe soft tissue density” on chest radiograph. Ignoring active disease on chest x-ray renders this strategy counterproductive and cost ineffective. '(Infect Control Hosp Epidemiol 2002;23:622-625).