A blood test is able to detect the presence of syphilis, which is diagnosed through a blood test in addition to clinical symptoms to make a general judgment. After the syphilis spirochete infects a person, a positive test can be performed using the syphilis spirochete particle agglutination test and the syphilis spirochete antigen serologic test. Whether or not the person has been cured, the test will be positive to see if the person was previously infected with syphilis. It is not possible to rely on this test to determine whether or not you are currently cured and whether or not you need to continue treatment. Other tests that are quantitative and dynamic, i.e. serological tests with non-syphilis spirochete antigens, such as the toluidine red unheated serological test or the rapid plasma reactin ring card test, should be used. The effectiveness of syphilis treatment can be judged on the basis of dynamic changes.