A negative syphilis serologic test means that you are not infected with syphilis, and if you have a positive syphilis serologic test, it means that you have been infected with syphilis or are currently infected with syphilis. Therefore, a negative syphilis serology test usually means that you are not infected with syphilis. However, there is a situation in which the syphilis serology test may be negative, when high-risk sex occurs within 40-90 days, which is the so-called window period of syphilis, within the window period to do the syphilis serology test, it is possible that the test is negative, but the body has been infected with syphilis, but the amount of syphilis spirochetes is relatively low, in the window period is not detected. It is generally recommended that patients have two tests at 3 months and 6 months after high-risk sexual behavior in order to completely rule out syphilis infection.