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Factors associated with viral load suppression in HIV-infected pregnant women in Rio de Janeiro, Brazil.

Viral load (VL) near delivery is a determinant of mother-to-child transmission (MTCT) of HIV. To evaluate factors associated with an undetectable VL near delivery in HIV-infected pregnant women receiving highly active antiretroviral therapy (HAART) and non-HAART regimens, HIV-infected pregnant women with a detectable VL at entry and having used antiretrovirals for ≥4 weeks before delivery were selected. Multivariate analysis was employed using binary logistic unconditional models; the dependent variable was having a VL <400 copies/mL near delivery. VL suppression was achieved in 403/707 women (57%): 65.4% in the HAART group, but only 26% in the non-HAART group P = 0.001. Duration of HAART was correlated with VL suppression, with maximum benefit seen after ≥12 weeks of therapy (odds ratio [OR]: 2.51; 95% confidence interval [CI]: 1.72-3.65). CD4+ cell count near delivery (OR: 1.53; 95% CI: 1.06-2.20) and baseline VL (OR: 0.74; 95% CI: 0.58-0.94) were also independently associated with VL suppression. Overall MTCT rate was 1.6%. HAART for ≥12 weeks, baseline VL and CD4 cell count near delivery were independently associated with viral suppression near delivery.

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