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The detection of T. pallidum DNA in plasma and urine from all patients with syphilis by nested PCR (nPCR) assay. (A) Detection of Tpp47 and polA in urine supernatant among all patients (n = 208). (B) Detection of Tpp47 and polA in urine sediment (n = 207). (C) Detection of Tpp47 and polA in plasma (n = 203). (D) Detection of Tpp47 and polA in paired plasma and urine sediment (n = 202).
