STDs are mainly transmitted through sexual contact, with sexual intercourse being the most important means of transmission. This is because during sexual intercourse, frequent and close contact between the skin and mucous membranes of both bodies occurs, and STD pathogens are easily transmitted to each other. In addition, the genitourinary tract has warm, moist characteristics, very suitable for the growth of STD pathogens. Therefore, once infected with pathogens, it is easy to grow and reproduce and become a STD patient. Other forms of sexual intercourse such as oral and anal sex can also allow pathogens to be transmitted to each other. STDs can also be transmitted through blood and from mother to child. At a certain stage in the development of an STD, the pathogen can be present in the bloodstream, at which point it can be contracted if blood with the STD pathogen is imported. This is particularly true of the spread of AIDS, as the AIDS virus is found mainly in the blood of patients. China requires serologic testing for HIV and syphilis before blood donation, and once found positive, blood donation is absolutely not allowed. Mother-to-child transmission refers to the fact that if a woman with STDs is not treated, the STD pathogens may be transmitted to the fetus through the umbilical cord blood, placenta, and the birth canal after pregnancy, e.g., pregnant women suffering from syphilis may infect the fetus in the uterus; and the pathogens present in the vagina may be transmitted to the fetus when the fetus passes through the birth canal at the time of delivery, e.g., gonorrhea, which may cause gonorrheal conjunctivitis to the fetus when the fetus passes through the birth canal. In addition, some STDs can be contracted through indirect contact, such as condyloma acuminatum, which can be transmitted through indirect contact with contaminated items, such as underwear, bathtubs, towels, and so on. In my outpatient clinic, there are cases of 2-year-old girls getting warts. Therefore, if you have a family with a sexually transmitted disease, you must do a good job of internal hygiene, to prevent the contamination of clothing and other household items, such as sun wash bedding, the patient’s underwear should not be mixed with the children’s wash, adults and children sleep in separate beds, separate use of bathtubs, toilet seat scrub every day, and so on.