- een reactieve serologische test (non-treponemale reacties: VDRL (Venereal Disease Research Laboratory) of RPR (rapid plasma reagin); treponemale reacties: FTA-ABS (fluorescent treponemal antibody absorbed) of MHA-TP (microhemagglutination assay for antibody to T. pallidum)).
- 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)].