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*sdNVP: single dose of nevirapine for the mother taken at the onset of labor and a single dose of nevirapine for the infant administered within 72 hours of delivery. **Due to low patient numbers in each individual grouping, these suboptimal interventions were grouped together. ***Based on 2006 WHO PMTCT guidelines. Abbreviations: ARV (antiretroviral), ART (antiretroviral therapy), AZT (zidovudine).
