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No-one with an undetectable viral load, gay or heterosexual, transmits HIV in first two years of PARTNER study
Gus Cairns, 2014-03-04 23:10:00

The second large study to look at whether people with HIV become non-infectious if they are on antiretroviral therapy (ART) has found no cases where someone with a viral load under 200 copies/ml transmitted HIV, either by anal or vaginal sex.

Statistical analysis shows that the minimum likely efficacy of successful HIV treatment in reducing the chance of transmitting HIV was 99% for any anal sex and 96% for anal sex with ejaculation where the HIV-negative partner was receptive; but the true efficacy is likely to be nearer to 100% than this.

When asked what the study tells us about the chance of someone with an undetectable viral load  transmitting HIV, presenter Alison Rodger said: "Our best estimate is it's zero."

Source:1