Upon inquiry, a doctor, official website, learned that he would check for AIDS when he applied for a health certificate. In addition to AIDS, he will also check whether hepatitis B, hepatitis C and syphilis can be transmitted through blood. Among them, hepatitis B and hepatitis C are mainly transmitted through blood, while syphilis and AIDS are mainly transmitted through sexual contact and blood. These diseases can also be transmitted vertically from mother to child, among which AIDS and syphilis are mainly transmitted through sexual contact.
People infected through sexual contact account for more than 90% of the total infected people, mainly young adults, and the age of 18-49 accounts for more than 80% of the total infected people, because this age group is sexually active.