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Plasma viral load predicts genital tract human immunodeficiency virus (HIV) shedding in HIV-infected women. We investigated whether local mucosal T-cell activation (HLA-DR, CD38, CCR5, and Ki67) contributed to HIV shedding in the genital tracts of HIV-infected women. We showed that cervical cytobrush-derived T cells expressed higher frequencies of T-cell activation markers (CD38+ and HLA-DR+) than blood-derived T cells. Expression was significantly higher in HIV-infected women than in uninfected women. We found that the frequency of activated proliferating cervical T cells (Ki67+; Ki67+CCR5+) broadly predicted HIV shedding in the genital tract in HIV-infected women, independently of plasma viral loads. Furthermore, activated cervical T cells (HLA-DR+CD38+ and HLA-DR+CCR5+) and local HIV shedding were independently associated with CD4 depletion in the genital tract. These data suggest that the presence of high frequencies of activated T cells in the female genital mucosa during HIV infection facilitates both local HIV shedding and CD4 T-cell depletion.

Immune Activation in the Female Genital Tract During HIV Infection Predicts Mucosal CD4 Depletion and HIV Shedding