Abstract
Background/Objectives: Human immunodeficiency virus (HIV) and tuberculosis (TB) remain major public health challenges in sub-Saharan Africa, which bears the highest burden of HIV/TB co-infection. Evidence is limited on whether the severity of virological failure is associated with workplace absenteeism among employed adults with HIV/PTB co-infection. This study examined workplace absenteeism across two viral-load categories among employed adults with documented virological failure in the Govan Mbeki sub-district. Methods: A retrospective record review with secondary data analysis was conducted among 286 employed mine workers with HIV/PTB co-infection and a viral load ≥1000 copies/mL after at least six months of antiretroviral therapy (ART). Clinical data were extracted from medical, laboratory, and TB-treatment records and linked to workplace sick-leave registers; limited participant contact was used only to clarify essential missing information. The analytic dataset had an observed minimum viral load of 1200 copies/mL. Viral load was categorised as 1200–10,000 versus ≥10,001 copies/mL. Absenteeism was the number of recorded sick-leave days during the preceding three months and, for logistic regression, was classified as low (5–10 days) versus high (11–15 days). Multivariable logistic regression was adjusted for age, sex, education, and structural/socioeconomic barrier score. Results: Mean absenteeism was 10.05 days (SD = 2.44). Of 286 participants, 181 (63.3%) had a viral load ≥10,001 copies/mL and 105 (36.7%) had a viral load of 1200–10,000 copies/mL. High absenteeism occurred in 129 participants (45.1%) and lower absenteeism in 157 (54.9%). Viral load category was not associated with high absenteeism after adjustment (aOR = 1.21, 95% CI: 0.76–1.92; p = 0.432). The model was not statistically significant (χ2 = 6.41, df = 5, p = 0.269), explained 3.0% of the variance (Nagelkerke R2 = 0.030), and had an acceptable Hosmer–Lemeshow fit (p = 0.913). Conclusions: Within this selected employed cohort with virological failure, high-level virological failure and absenteeism were both common, but no evidence of an independent association between viral-load category and high absenteeism was detected. The cross-sectional temporal structure, healthy-worker selection, limited exposure contrast, and residual confounding constrain causal interpretation. Integrated public health and workplace interventions are suggested to improve both treatment outcomes and workforce participation in high-burden settings.