<p>Data are given as median (range), or frequencies.</p>a<p>“Duration of asymptomatic neurosyphilis” means the period between the patient's high risk behaviors which may be infected with <i>T. pallidum</i> and the confirmed neurosyphilis. “Duration of symptomatic neurosyphilis” means the duration of clinical manifestations;</p>b<p>includes 16 subjects with secondary syphilis, 2 subjects with early latent and 22 subjects with latent or unknown duration.</p
