The serologic tests for syphilis including VDRL and FTA-abs tests have been carried out in adult VISA applicants for emigration and blood donors from February, 1977 to May, 1978. The results are summarized as follows: 1. In 3,393 VISA applicants the reactive rate of VDRL test was 2.9%, and the standard. 2. VDRL test showed a positive rate of 2.3% in 6,220 blood donors. 3. The quantitative test of VDRL resulted in low titer below 1:4 in 93.9% of VDRL reactive VISA applicants. From the results it is clear that the prevalence of syphilis is gradually increasing recently compared to the late 1960`s and early 1970`s.