Background.Antiretroviral medications are key for prevention ofmother-to-child transmission (PMTCT) of HIV, and transmission\nmitigation is affected by service delivery, adherence, and retention. Methods.We conducted a cluster-randomized controlled study in\n26 facilities inNyanza, Kenya, to determine the efficacy of SMStext messages onPMTCT outcomes.Therelative risk and confidence\nintervalswere estimated at the facility level using STATA. Results. 550 women were enrolled, fromJune 2012 to July 2013.Themedian\nage was 25.6 years, and 85.3% received ARVs. Maternal ARV use was similar between the intervention and control arms: 254/261\n(97.3%) versus 241/242 (99.6%) at 34ââ?¬â??36 weeks of gestation and 234/247 (94.7%) versus 229/229 (100%) at delivery. Among infants,\n199/246 (80.9%) and 209/232 (90.1%) received ARVs (RR: 0.91; 95% CI: 0.77ââ?¬â??1.14); 88% versus 88.6% were tested for HIV at 6 weeks,\nwith 1/243 (0.4%) and 3/217 (1.4%) positive results in the intervention and control arms, respectively. Communication increased\nin both the intervention and control arms, with the mean number of 7.5 (SD: 5.70) compared with 6 (SD: 9.96),
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