TABLE 1.
Sensitivities for the detection of Treponema pallidum antibodies stratified by RPR titera
| RPR titer (no. of samples) | Sensitivity (%) of INSTI Multiplex compared to a reactive TP-PAb test (95% CI) |
|---|---|
| Nonreactive (31) | 66.7 (48.6–83.3) |
| 1:1 (33) | 87.9 (71.8–96.6) |
| 1:2 (33) | 97.0 (84.2–99.9) |
| 1:4 (34) | 85.3 (68.9–95.0) |
| ≤1:4 (100) | 90.0 (82.4–95.1) |
| ≥1:8 (37) | 97.3 (85.8–99.9) |
| All TP-PA reactive sera (168) | 87.4 (81.4–92.0) |
a
A higher titer indicates a more recent infection. RPR, rapid plasma reagin.
b
TP-PA, Treponema pallidum particle agglutination.