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发表于 2012-1-14 01:22
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In a 1987-1991 study of mixed-HIV-status couples, all 123 couples who used condoms every time for four years prevented transmission of HIV. In another study, among 122 couples who DID NOT use condoms every time, 12 partners became infected. In yet another large study, among couples who used condoms consistently, there were 0, 1.1, and 1.0 seroconversions per 100-person years (CDC). These numbers speak to the decreased odds of transmission when condoms are used.
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