Abstract
The concentration of viral RNA in plasma is the primary risk factor for sexual transmission of HIV-1 [1–3], and reductions in plasma HIV-1 RNA levels due to antiretroviral therapy (ART) result in marked decreases in HIV-1 transmission risk [4,5]. Results from studies of HIV-1 transmission and disease progression may be more difficult to interpret if a substantial proportion of HIV-1 infected partners have low or undetectable viral loads on ART, and thus, ART use at study enrollment is often an exclusion factor.
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