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Results of three CSF measures in samples from individuals with asymptomatic or symptomatic syphilitic meningitis whose CSF-VDRL was nonreactive. The stacked bars show the number of CSF samples at or above set thresholds (gray) vs. below the set thresholds (black) for CSF-TPPA titer or CSF-CXCL13, and in which T. pallidum rRNA was (gray) vs. was not (black) detected by RT-PCR.
