Objective: To define clinical and laboratory features that identify patients with neurosyphilis.
Methods: Subjects (n=326) with syphilis but no previous neurosyphilis who met 1993 Centers for Disease Control and Prevention criteria for lumbar puncture underwent standardized history, neurological examination, venipuncture, and lumbar puncture. Neurosyphilis was defined as a cerebrospinal fluid (CSF) white blood cell count >20 cells/ microL or reactive CSF Venereal Disease Research Laboratory (VDRL) test result.
Results: Sixty-five subjects (20.1%) had neurosyphilis. Early syphilis increased the odds of neurosyphilis in univariate but not multivariate analyses. In multivariate analyses, serum rapid plasma reagin (RPR) titer > or =1 : 32 increased the odds of neurosyphilis 10.85-fold in human immunodeficiency virus (HIV)-uninfected subjects and 5.98-fold in HIV-infected subjects. A peripheral blood CD4+ T cell count < or =350 cells/ microL conferred 3.10-fold increased odds of neurosyphilis in HIV-infected subjects. Similar results were obtained when neurosyphilis was more stringently defined as a reactive CSF VDRL test result.
Conclusion: Serum RPR titer helps predict the likelihood of neurosyphilis. HIV-induced immune impairment may increase the risk of neurosyphilis.
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