VIBRA trial – Effect of village-based refill of ART following home-based same-day ART initiation vs clinic-based ART refill on viral suppression among individuals living with HIV: protocol of a cluster-randomized clinical trial in rural Lesotho
Authors: Amstutz Alain , Lejone Thabo Ishmael , Khesa Lefu , Muhairwe Josephine , Nsakala Bienvenu Lengo , Tlali Katleho , Bresser Moniek , Tediosi Fabrizio , Kopo Mathebe , Kao Mpho , Klimkait Thomas , Battegay Manuel , Glass Tracy Renée , Labhardt Niklaus Daniel 
Published: January 2019

Abstract
Background: There is a need for evaluating community-based antiretroviral therapy (ART) delivery models to improve overall performance of HIV programs, specifically in populations that may have difficulties to access continuous care. This cluster-randomized clinical trial aims to evaluate the efficacy of a multicomponent differentiated ART delivery model (VIBRA model) after home-based same-day ART initiation in remote villages in Lesotho, Southern Africa.
Methods: VIBRA (Village-Based Refill of ART) trial is a cluster-randomized, parallel-group, superiority clinical trial conducted in two districts of Lesotho, Southern Africa. Clusters (i.e. villages) are randomly assigned to either the VIBRA model or standard of care, stratified by district, village size, and village access to the nearest health facility. Eligible individuals (HIV-positive, aged 10 years or older, not taking ART) found during community-based HIV testing campaigns are offered same-day home-based ART initiation. Intervention clusters offer a differentiated ART delivery package with two features: Firstly, drug-refill and follow-up through trained and supervised village health workers. Secondly, the option of receiving individually tailored adherence reminders and viral load result notifications via SMS. Standard of care applies for the control clusters, i.e. ART visits at the clinic and no SMS. The primary endpoint is viral suppression 12 months after enrolment. Secondary endpoints include linkage to and engagement in care. Furthermore, safety and cost-effectiveness analyses plus qualitative research are planned. Minimum target sample size is 262 participants. Statistical analyses will follow CONSORT guidelines. VIBRA trial is linked to another trial, the HOSENG (HOme-based SElf-testiNG) trial, in the GET ON (GETing tOwards Ninety) research project.
Discussion: VIBRA trial is among the first to evaluate ART delivery through VHW immediately after ART-initiation and it assesses the entire HIV care cascade from testing to viral suppression. As most countries in sub-Saharan Africa have cadres similar to the VHW program in Lesotho, this model – if shown to be effective – has potential to be scaled up. The system impact evaluation will provide valuable cost estimations, and the qualitative research will suggest how the model could further be modified to optimize impact.
Trial Registration: This trial has been registered at clinicaltrials.gov (NCT03630549) on August 15, 2018.
Keywords: HIV, cluster randomized controlled trial, village health worker, community health worker, home-based, differentiated care and delivery, antiretroviral therapy, Lesotho, Southern Africa, multi component intervention.