TABLE 4.

Clinical diagnosis of primary syphilis made by using syphilis serology and patient history as a model for a general practitioner setting versus the result of the T. pallidum real-time PCRa

T. pallidum real-time PCR resultNo. of samples with the following result for clinical diagnosis in GP settingb:
+
+7617
26597
  • a The data are for a total of 716 cases. The sensitivity of the T. pallidum real-time PCR was 75%, and its specificity was 97%. The kappa value was 0.745, which indicates good agreement between the results of the two tests.

  • b Primary syphilis was diagnosed either in patients with a positive TPPA result (irrespective of the RPR test result) without a history of syphilis or in patients with an RPR titer of ≥1:8 and a history of syphilis (Fig. 2).