ABSTRACT
A total of 114 sera from patient with suspected syphilis were included in this study. All sera were screened by the VDRL and TPHA tests. The reactive sera confirmed by FTA-ABS test and quantitatively by TPHA test. The main data obtained can be summarized as follows: -Syphilis was detected in 12.2% by VDRL, 10.5% by TPHA and 9.6% by FTA-ABS. -All specimens which were positive in the two screening tests were also FTA-ABS positive. -Sera found to be positive in TPHA test and negative VDRL also showed 100 percent agreement with FTA-ABS test. The effect of antisyphilitic treatment on serological reaction, the VDRL became negative of and persisted positive in both TPHA and FTA-ABS tests. -TPHA carried out quantitatively and the titre ranged between 1:60 and 1:2560 -Sera from presumed biological false positive reactors, gave negative in both TPHA and FTA-ABS tests