When the quantitative RPR card test is performed on patients with syphilis, a fourfold rise in titer in a repeat specimen may suggest an infection, a reinfection, or a treatment failure; a fourfold decrease in titer following treatment for early syphilis usually indicates that therapy was adequate...
as: (1) confirmed proven or highly probable; (2) possible; or (3) less likely. 2.2. Statistical Analysis We assumed that the inverse of the RPR titer was proportional to the antibody concentration. The data were summarized using the number (n) and percentage for binary variables and median...