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We prospectively investigated the diagnostic utility of the Xpert MTB/RIF (Mycobacterium tuberculosis/rifampin [RIF] resistance) assay in 20 cases with confirmed tuberculous pleural effusion. The sensitivity and specificity of the Xpert assay in pleural fluid were 25% and 100%, respectively. All cases positive by the Xpert assay were also positive by pleural fluid culture.
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Friedrich et al. (2011) studied this question.
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