Most of these patients have a history of high-risk sexual activity or multiple sexual partners, which can lead to Chlamydia trachomatis infection, so our country classifies Chlamydia trachomatis infection as one of the STDs. Not all Chlamydia trachomatis infections are caused by a history of high-risk sex, for example, if someone wears the patient’s underwear, then it may lead to infection; if it is a public place, such as bathing in the bath, the patient has sat in the place where others go to sit, it may also cause indirect infection.