Sexually transmitted diseases (STDs) are a group of infectious diseases that are transmitted through sexual contact, similar sexual acts and indirect contact, not only in the genitourinary organs, but also in the lymph nodes of the genitourinary organs through the lymphatic system, and even in the important tissues and organs of the whole body through hematogenous dissemination. The broad sense of STD includes many kinds: syphilis, gonorrhea, non-gonococcal urethritis, condyloma acuminatum, genital herpes, AIDS (AlDS), soft chancre, lymphogranuloma venereum, genital candidiasis, trichomoniasis, bacterial vaginosis, lice, scabies, hepatitis B and ringworm are also included, and there are more than 20 kinds of STD. And we people often say that STDs mainly refers to the first eight kinds. The transmission of STDs include: 1, sexual transmission: is the main mode of transmission of STDs; 2, indirect contact transmission: contact with clothing contaminated by pathogens; 3, blood and blood products transmission: syphilis and AIDS; 4, organ transplantation, artificial insemination transmission: such as AIDS; 5, occupational transmission: mainly refers to occupational exposure such as medical and nursing laboratory personnel and police officers; 6, placental transmission: transmitted from the sick mother to the fetus, such as syphilis, syphilis, artificial insemination, etc. 6, placental transmission: from sick mother to fetus, such as syphilis, chlamydia, mycoplasma, HIV infection, etc.; 7, obstetric transmission: gonorrhea conjunctivitis, chlamydia, HIV infection, etc.