Transmission of HIV

In the industrialized world, transmission occurs most commonly through men having sex with men and through sharing of infected "works" by injection drug users. Heterosexual transmission is on the rise in industrialized countries, and it is the most prevalent form of transmission in Africa and India. Transmission also occurs from infected mother to fetus and through the administration of contaminated blood products. The latter is no longer an important risk in industrialized nations but poses a continuing hazard elsewhere. From the standpoint of sexual transmission, both unprotected anal and vaginal intercourse constitute the most risky circumstances, with orogen-ital sex representing a fairly small risk and other activities such as kissing regarded as essentially risk free.

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