No-one with an undetectable viral load, gay or heterosexual, transmits HIV in first two years of PARTNER study
Viral load suppression means risk of HIV transmission is 'at most' 4% during anal sex, but final results not due till 2017
Gus Cairns - 04 March 2014
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 maximum likely chance of transmission via anal sex from someone on successful HIV
treatment was 1% a year for any anal sex and 4% for anal sex with ejaculation where the HIV-negative partner was receptive; but the
true likelihood is probably much nearer to zero 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."
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