Syphilis is not AIDS, syphilis and AIDS are two different infectious diseases, both are class B infectious diseases, syphilis and AIDS have different pathogens, different clinical manifestations, and different laboratory test items and results. Syphilis is caused by the syphilis spirochete, which can be transmitted sexually and vertically from mother to child. There are special drugs for syphilis, and long-acting penicillin treatment is effective. AIDS is caused by the HIV virus, which attacks the immune system of the human body and leads to low immunity and immune deficiency. These two diseases are not interchangeable. If a patient has syphilis and is afraid that he or she will be reinfected with HIV, he or she can undergo another HIV test for screening.