Sexually transmitted diseases (STDs) are a group of infectious diseases that are transmitted mainly through sexual contact, similar sexual behavior and indirect contact, and can occur not only in the genitourinary organs, but also in the lymph nodes belonging to the genitourinary organs through the lymphatic system, and even in all important tissues and organs of the body through hematogenous dissemination. Sexually transmitted diseases seriously endanger the physical and mental health of patients and can lead to infertility, genital deformities, disfigurement and characteristic sequelae. The STDs specified in the regulations related to the prevention and control of infectious diseases in China include: gonorrhea, syphilis, condyloma acuminatum, non-gonococcal urethritis (non-gonococcal cervicitis), genital herpes, soft chancre, lymphogranuloma venereum and AIDS, and eight others. The common pathogenic microorganisms of STD: Gonorrhea: Neisseria gonorrhoeae Syphilis: Syphilis spirochetes Condyloma acuminatum: Human papillomavirus Non-gonococcal urethritis: Chlamydia trachomatis, Mycoplasma solium Genital herpes: Herpes simplex virus Soft chancre: Haemophilus ducreyi Venereal lymphogranuloma: Chlamydia trachomatis AIDS: Human immunodeficiency virus The common transmission routes of STD are: 1. Other similar sexual behaviors (oral sex, anal sex, masturbation, kissing, touching, etc.) can increase the chance of infection. 2, indirect contact transmission: through contact with contaminated clothing, public goods or public sanitary ware and other infections. 3, blood and blood products transmission: through the input of blood or blood products contaminated with pathogenic microorganisms, as well as intravenous addicts sharing syringes or needles transmission. 4, vertical transmission from mother to child: the sick mother can infect the fetus through the placenta, the fetus during delivery through the birth canal or infect the baby through breastfeeding. 5.Medical transmission: contaminated medical devices can infect others through physical examination, injection, surgery, etc.; medical personnel can infect themselves during medical operations due to poor protection. 6, organ transplantation, artificial insemination and other transmission.