[CSF diagnosis in syphilis]

Treponemal antibodies in CSF are often to be found by FTA-ABS and TPHA, also in cases without syphilis cerebrospinalis. The checking of the CSF barrier allows--together with the TPHA-index--the diagnostic of the syphilis cerebrospinalis. Antibodies against treponema pallidum have been proved in 15 patients at different stages of syphilis until 30 years after treatment, but the titres were low. Only in one case we have found an active syphilis cerebrospinalis by the help of the TPHA- and IgG-index.