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TOPIC: Numerical_risk_data_for_HIV
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Found a study that gave numerical relative risks for HIV:

"For instance, research indicates that anal sex is 2 to 3 times more risky than vaginal sex, and vaginal sex with a condom is said to be 10 times less risky than vaginal sex without a condom (Hearst & Hulley, 1988; Padian et al., 1987)."

Another study:

"RESULTS: Choosing a partner who tested negative instead of an untested partner reduced the relative risk of HIV infection 47-fold; using condoms, 20-fold; and choosing insertive fellatio rather than insertive anal sex, 13-fold."

Enosburg Falls VT
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TOPIC: Numerical risk data for HIV