Anal sex hiv transmission

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Analyzed studies indicate about a 1. Anal intercourse without condoms propels the HIV epidemic in men who have sex with men MSMand many heterosexual couples have anal sex [2]. To update previous work on per-act HIV transmission rate with anal sex, Imperial College London researchers and collaborators at other centers conducted a new systematic review and meta-analysis.

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What do the latest studies tell us about this risk?

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The risk of HIV through unprotected anal intercourse is seen to be extremely high, as much 18 times greater than vaginal intercourse. The reasons for the increased risk are well known and include such factors as:. Furthermore, the secretion of blood from damaged rectal tissues can increase the risk for the insertive "top" partner, providing the virus a route of transmission through the urethra and tissues that line the head of the penis particularly under the foreskin.

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