Abstract
All human immunodeficiency virus type 1 (HIV-1)-infected inocula, such as genital secretions, breast milk, and blood, contain both cell-free virus and infected cells. The relative contributions of cell-free and/or cell-associated virus in establishing an infection in a naive host during the different modes of HIV-1 acquisition remains unclear. Studies aim to elucidate the source of the acquired virus because strategies to prevent acquisition may have differential efficacy against the different modes of transmission. In this review, I will detail some of the challenges in identifying the source of the transmitted virus, genotypic and phenotypic differences among cell-free compared with cell-associated HIV-1, and implications on the efficacy for prevention strategies.
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