Differentiated Service Delivery Model in Improving HIV Treatment Outcomes Among Female Sex Workers in Gauteng Province of South Africa: A Protocol Paper.

South Africa developed the differentiated service delivery (DSD) model to improve access to healthcare for people living with HIV (PLHIV), especially key populations (KPs) including female sex workers (FSWs) who often face barriers in accessing HIV services. The DSD model, aims to reduce the burden on healthcare users, healthcare workers, and the healthcare system, can significantly benefit this group. However, the success of the DSD model in achieving the desired HIV treatment outcomes for FSWs has been barely evaluated. This paper describes the protocol for evaluation of the DSD model in improving HIV treatment outcomes among FSWs in Gauteng Province of South Africa. Both qualitative and quantitative methods will be utilized to address three study objectives: stakeholder analysis, mapping, and in-depth interviews (objective 1); programme evaluation of the DSD model in selected sites (objective 2); and development of a framework for optimizing the DSD model in improving HIV treatment outcomes (objective 3). Quantitative statistical analysis will be performed using STATA version 17 (College Station, TX, USA). Qualitative analysis will be performed using ATLAS.ti. This study will provide new insights into the utilization of the DSD model among FSWs in South Africa. It will also inform new strategies for the DSD model's implementation in the country. This study will contribute towards the development of a framework for strengthening the DSD model in improving HIV treatment outcomes among FSWs in Gauteng Province.