Data analysis
An initial code-book was designed using A descriptive thematic analysis was chosen to explore and describe the factors leading to PNP barriers and facilitators (Themes and sub-themes.PNP: post-natal prophylaxis; ART: antiretroviral treatment.Trustworthiness was enhanced through member checks and feedback was also obtained from dissemination with national stakeholders, the study team and PROMISE-EPI staff.Data from PROMISE-EPI electronic Case Report Form (eCRF) were used to present the participants characteristics. Statistical analyses, including student test for mother’s age and Fisher exact test for other variables, were carried out using Stata 16.1 (Stata Corp, College Station, Texas). Missing data were omitted from percentage calculations.