There are two possibilities for a negative serologic test for syphilis with no typical symptoms of syphilis: one with no risk of latent infection and one with the possibility of latent infection. Syphilis is a sexually transmitted disease caused by syphilis spirochete infection, syphilis infection through the incubation period of 14-90 days, the body produces syphilis serum antibodies, blood test positive reaction. 1. No latent danger: If the syphilis blood test is negative after the incubation period of syphilis, and there are no typical symptoms of syphilis, syphilis infection can be excluded and there is no latent danger of syphilis. 2. There is a danger of latent infection: if the syphilis serum test is negative within the latent period of syphilis, without the typical symptoms of syphilis, syphilis infection can not be excluded, you need to exceed the latent period of syphilis after the syphilis serum test again, if the results are negative, you can exclude the danger of latent syphilis. If the result is negative, the risk of syphilis can be ruled out. If there is any doubt about whether a negative syphilis serologic test without typical symptoms of syphilis can rule out the risk of syphilis, it is recommended to consult a doctor in a timely manner.