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Scatter plot of quantitative values reported by each assay (y axis: CT of probe C for the Xpert MTB/RIF, CN for the RT MTB, liquid culture time to detection [ttd], and smear grade [0 to 3]). The dotted horizontal line illustrates the CN cutoff of 35, above which the RT MTB assay that generated a positive result could not report a result from the RT MTB RIF/INH reflex assay.
