TABLE 4.

Detection of anti-T. pallidum IgM antibodies during early syphilis by the FTA-Abs test for IgM and the ELISA for IgM

Syphilis stageaFTA-Abs test for IgMELISA for IgM
No. of reactive samples/total no. of samples tested (%)No. of nonreactive samples/total no. of samples tested (%)No. of samples with indeterminate results/total no. of samples tested (%)No. of reactive samples/total no. of samples tested (%)No. of nonreactive samples/total no. of samples tested (%)No. of samples with indeterminate results/total no. of samples tested (%)
PS18/25 (72)1/25 (4)6/25 (24)22/25 (88)2/25 (8)1/25 (4)
SS17/25 (68)6/25 (24)2/25 (8)19/25 (76)5/25 (20)1/25 (4)
LS30/179 (17)143/179 (80)6/179 (3.3)34/179 (19)143/179 (79.9)2/179 (1.1)
Total65/229 (28.4)150/229 (65.5)14/229 (6.1)75/229 (32.8)150/229 (65.5)4/229 (1.7)
  • a PS, primary syphilis; SS, secondary syphilis; LS, latent syphilis.