Completion rate of tuberculosis preventive therapy and incidence of tuberculosis among people living with the Human Immunodeficiency Virus on antiretroviral therapy in Ekurhuleni East subdistrict, Gauteng province.

Abstract

Introduction: the World Health Organization (WHO) has recommended the use of tuberculosis preventive therapy (TPT) as part of a comprehensive care package for the reduction of tuberculosis (TB) incidence among people who are living with human immunodeficiency virus (PLWHA). When used optimally, TPT efficacy ranges between 60% and 90% among adults and children who are living with HIV. Despite the wide adoption of this intervention in South Africa, the country remains heavily burdened with high rates of TB/HIV co-infections, reported to be 59% in 2018. Reported challenges include low uptake and completion rates. This study aimed to determine the TPT completion rate and investigate the incidence of TB among antiretroviral therapy (ART) patients who were initiated on TPT.

Methods: this descriptive cross-sectional retrospective cohort study was conducted among HIV-positive patients who were on ART, 18 years old and above, and had been initiated on TPT between June 2019 and June 2021 at the selected PHC facilities in Ekurhuleni East sub-District. We conducted record reviews and face-to-face interviews to collect data. These were captured onto a Microsoft Excel spreadsheet, cleaned, and coded before importation onto the Epiinfo version 7 statistical software package for statistical analyses.

Results: the study found a majority of female participants, (60.5%). The median age of participants was 39.0 years (IQR=15), with most aged 50 years old and above, (21.3%). The treatment course of TPT was completed at the prescribed 12 months by 196 (30%) of the 395 participants. Only 12 (3%) of the participants were found to have TB, half 6 (50%) of which were breakthrough cases of TB. The reasons for non-completion of TPT included clinicians not offering it to patients, (46/276 (16.7%)). The barriers to TPT completion included not having a treatment supporter, (73.2%); p<0.001, while disclosure of positive HIV status was found to facilitate TPT completion (83.2%); p<0.001.

Conclusion: the observed TPT completion rate of 30% needs to be addressed as it is far below the national threshold of 85%. The barriers and facilitators to TPT completion also require attention to help improve the TPT completion rate.