If you have engaged in high-risk sexual behaviors, or suspect that you might have contracted HIV or syphilis for any other reason, then it is necessary to go to a qualified hospital in a timely manner for blood tests to check for syphilis antibodies, syphilis titers, and HIV antibodies. If the syphilis antibody test is positive and the titer is high, timely treatment should be sought. If the HIV antibody test is positive, then it is necessary to visit a disease control center or a medical institution designated by the government for further confirmatory tests to either rule out or confirm HIV infection.