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The venereal disease research laboratory (VDRL) test is designed to assess whether you have syphilis, a sexually transmitted infection (STI). Syphilis is caused by the bacterium Treponema pallidum.

Data from a large study of syphilis indicate a high rate of neurosyphilis in HIV-infected patients with a CD4-cell count less than or equal to 350 or a serum RPR titer greater than or equal to 1:32.

A colleague treated a patient for secondary syphilis, then repeated the course of treatment because the RPR remained positive after the second course of treatment. How long does it take for the RPR ...