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Estimated cumulative risk (with 95% confidence intervals) of (A) human immunodeficiency virus type 1 (HIV-1) infection or (B) HIV-1 infection or death by 28 weeks among infants HIV-1 uninfected at birth by study arm. Abbreviations: AZT, zidovudine; BAN, Breastfeeding, Antiretrovirals and Nutrition study; HIV-1, human immunodeficiency virus type 1; NVP, nevirapine; PEPI, Post-Exposure Prophylaxis of the Infant study; SWEN, Six-Week Extended Nevirapine study.
