Abstract: Syphilis, gonorrhea and genital Chlamydia trachomatis infection are main sexually transmitted diseases which need focused prevention and treatment in China. Clinical manifestations of syphilis are complicated. According to its duration of onset, clinical features, and transmission routes, syphilis can be classified as primary syphilis, secondary syphilis, tertiary syphilis, neurosyphilis, latent syphilis and congenital syphilis. Gonorrhea and genital Chlamydia trachomatis infection mainly affect genitourinary tract, and their clinical manifestations markedly vary from asymptomatic types to complicated types. Diagnosis of the 3 diseases should be based on their epidemiological history, clinical manifestations and laboratory examination results. Treatment should be started according to recommended regimens as early as possible. Appropriate follow-up should be performed after treatment. The antimicrobial resistance in gonorrhea has become a clinical concern.

Key words: Syphilis, Gonorrhea, Chlamydia infections, Chlamydia trachomatis, Diagnosis, Therapy, Guidelines