In fact, AIDS is not very contagious. Usually, the risk of AIDS needle-stick injury is only about 3 per 1,000, that is, the risk of a person contracting AIDS is about 3 per 1,000 if a needle with AIDS blood sticks a person. If you have unprotected sex with someone who is clearly living with HIV, the risk of infection is about 1 in 1,000. The risk is even lower if the person has sex with a condom, and the risk is less than one in 10,000 if the person has sex with a condom multiplied by fifteen percent on top of the risk of having sex without a condom. AIDS is mainly contracted through repeated, unprotected sex, while others are contracted through needle-stick injuries, invasive procedures in informal institutions, mother-to-child transmission, etc. Ordinary household contacts are not susceptible to infection.