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In Central Africa, vertical transmission of human immunodeficiency virus (HIV) infection from mother to child approaches 30%, reflecting in part inadequate implementation of postnatal preventive strategies, especially during breastfeeding [].

A total of 224 subjects will be randomized into four groups (SMS, Call, SMS Call, and Control) with an allocation ratio of 1:1:1:1.

SMS and calls will be sent between 48 and 72 hours before the scheduled appointment.

We will carry out a 2 x 2 factorial, multicenter randomized controlled trial, single-blind with an allocation ratio of 1:1:1:1 for adult-child pairs to four groups.

Group 1 will serve as the control group and is composed of subjects provided an appointment and no reminder, reflecting the usual standard of care.

Group 2 subjects will be provided an appointment and an SMS reminder.