HIV Transmission Risk During Anal Sex 18 Times Higher than During Vaginal Sex

Published: June 28, 2010

The risk of HIV transmission during anal intercourse may be around 18 times greater than during vaginal intercourse, according to the results of a meta-analysis published online ahead of print in the International Journal of Epidemiology.

Moreover, as well as this empirical work, the researchers from Imperial College and the London School of Hygiene and Tropical Medicine carried out a modelling exercise to estimate the impact that HIV treatment has on infectiousness during anal intercourse. They estimate that the risk of transmission from a man with suppressed viral load may be reduced by as much as 99.9%.

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