- Réaction sérologique positive [tests non tréponémiques: Venereal Disease Research Laboratory (VDRL) ou rapid plasma reagin (RPR); tests tréponémiques: test d'immunofluorescence absorbée (fluorescent treponemal antibody absorbed - FTA-ABS) ou test de microhémagglutination (microhemagglutination assay for antibody to T. pallidum - MHA-TP)].
- Reaktiver serologischer Test (nontreponemal: VDRL-Test - in den Venereal Disease Research Laboratories, USA, entwickelt - oder RPR-Test - Rapid Plasma Reagin; treponemal: FTA-ABS-Test - Fluoreszenz-Treponemen-Antikörper-Absorbtionstest - oder MHA-TP-Test - Mikrohämagglutinationstest auf Antikörper gegen T. pallidum)