The probability of HIV infection is relatively high, so it is important to do a good job of preventing HIV. The probability of HIV infection is relatively high, and it can be transmitted through blood contact, sexual contact, and mother-to-child contact. When there is a history of high-risk exposure to these modes of transmission, it is possible to become infected with HIV. Therefore, when there is a history of high-risk exposure, it is recommended to take oral antiretroviral blocking medications, such as efavirenz, lamivudine, tenofovir, and so on, in a timely manner. After regular antiretroviral blocking treatment, the transmission of HIV can be effectively blocked, and the earlier the medication is taken, the higher the success rate of blocking. To prevent the spread of HIV, you should avoid sexual promiscuity, drug abuse, blood trading and other illegal behaviors. You should also be careful to take safety precautions during sexual intercourse.