Prevention:

• Avoid injected (intravenous) drugs. If you use IV drugs, avoid sharing needles or syringes. Always use new needles. (Boiling or cleaning them with alcohol does not guarantee that they're sterile.)
• Avoid oral, vaginal, or anal contact with semen from HIV-infected people.
• Avoid unprotected anal intercourse, since it causes small tears in the rectal tissues, through which HIV in an infected partner's semen may enter directly into the other partner's blood.
• If you have sex with people who use IV drugs, always use protection.
• If you have sex with many people or with people who have multiple partners, always use protection.
• People with AIDS or who have had positive HIV antibody tests can pass the disease on to others. They should not donate blood, plasma, body organs, or sperm. They should not exchange genital fluids during sexual activity.
• Safer sex behaviors may reduce the risk of getting the infection. There is still a slight risk of getting the infection even if you practice "safe sex" with the use of condoms. Abstinence is the only sure way to prevent sexual transmission of the virus.
• Use protection when having sexual contact with people you know or suspect of being infected with HIV. Even better, use protection for ALL sexual contact.