Health certificate anal examination refers to anal sampling for intestinal pathogenic bacteria culture.
Candidates pull down their pants and put their hands on their knees to show their anus. The staff used a special anal probe (or cotton swab) to go deep into the anus and rectum, and after rotating, they took feces for cultivating intestinal bacteria.
Clinically, anal examination is a way for doctors to examine patients' intestines and rectum. Gynecology is often used to check the gynecological diseases of virgins, the degree of uterine opening during childbirth and the abdominal tumors of women in obstetrics.