The heterogeneity among people re-engaging in antiretroviral therapy highlights the need for a differentiated approach: results from a cross-sectional study in Johannesburg, South Africa.

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Disengagement and re-engagement with antiretroviral therapy (ART) are common in South Africa, but routine monitoring is insufficient to inform policy development. To address this gap, Anova implemented the 2020 National Adherence Guidelines' re-engagement standard operating procedure (re-engagement SOP) and collected additional data to describe the characteristics of re-engagement visits to inform HIV programmes. Between July and December 2022, we conducted a study at nine primary healthcare facilities in Johannesburg. Staff were trained on the re-engagement SOP and provided with job aides to support implementation. Administration clerks categorized visits based on the time elapsed since the missed appointment: ≤14days and >14 days, with the latter identified as re-engaging. For these clients, clinicians filled out "re-engagement clinical assessment forms" that included visit dates, both clinician-assessed and self-reported treatment interruptions, and clinical details. Data on missed appointments and previous viral loads were extracted from medical records. The information was entered into REDCap. We present data from three out of the nine facilities, selected for their comprehensive data collection and high coverage of all re-engaging clients. A total of 2342 clients returned following a missed scheduled appointment. The majority, 1523 (65%), missed their appointments by ≤ 14 days, while 819 (35%) were >14 days late (re-engaging). Among those re-engaging, 635 (78%) re-engagement clinical assessment forms were completed. A missed appointment date was available for 623 with 25% (n = 161) returning 2-4 weeks late, 47% (n = 298) 4-12 weeks and 26% (n = 164) >12 weeks late. Self-reported ART interruption, available for 89% (567/635), indicated the majority (54%, n = 304) experienced no interruption. Clinical concerns were identified in 65 (10%) cases. A majority (79%, 504/635) had prior viral load results, with 73% (370/504) below 50 copies/ml. Clients frequently return to care shortly after missed appointments. Despite missing scheduled ART refill dates, many report not interrupting treatment, either having treatment on hand or sourcing ART elsewhere. Most re-engaging clients were adherent prior to disengagement, and clinical concerns are rare. A differentiated service delivery approach, prioritizing flexibility and reduced healthcare burden, is required to support client's needs and preferences at re-engagement.