The study proves, researchers said, that using antiretroviral therapy to suppress the AIDS virus to undetectable levels also means it cannot be passed on via sex.
She said this"powerful message" could help end the HIV pandemic by preventing the virus' transmission in high-risk populations. In this study alone, for example, the researchers estimate that the suppressive antiretrovial treatment prevented around 472 HIV transmissions during the eight years.
The study, published in the Lancet medical journal on Thursday, assessed the risk of HIV transmission between serodifferent gay male couples - where one partner is HIV-positive and one is HIV-negative - who do not use condoms. Its findings add to an earlier phase of the study which looked at HIV transmission risk for serodifferent heterosexual couples in the same circumstances. It also found zero risk.
While 15 of the men among the 972 gay couples in this phase did become infected with HIV during the eight years of follow-up, genetic testing showed their infections were with strains of HIV acquired from another sexual partner. Since the start of the AIDS epidemic in the 1980s, more than 77 million people have become infected with HIV. Almost half of them - 35.4 million - have died of AIDS.
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