Objective:
Preventing secondary HIV transmission from adolescents and young people living with HIV (AYPLHIV) to their partners and children is critical to interrupting the HIV infection cycle in sub-Saharan Africa. We investigated predictors of secondary HIV transmission risk (past-year sexual risk combined with past-year viremia) among AYPLHIV in South Africa.
Design:
A prospective cohort of AYLPHIV in South Africa recruited
n
= 1046 participants in 2014–2015, 93.6% of whom were followed up in 2016–2017 (1.5% mortality). Questionnaires used validated scales where available and biomarkers were extracted from
n
= 67 health facilities.
Methods:
Multivariate logistic regressions tested baseline factors associated with secondary HIV transmission risk, controlling for covariates, with marginal effect modelling combinations.
Results:
About 14.2% of AYPLHIV reported high secondary HIV transmission risk. High-risk AYPLHIV were more likely to be sexually infected [adjusted odds ratio (aOR) 2.79, 95% confidence interval (95% CI) 1.66–4.68,
P
< 0.001], and report hunger (aOR 1.93, 95% CI 1.18–3.14,
P
= 0.008) and substance use (aOR 2.19, 95% CI 1.19–4.02,
P
= 0.012). They were more likely to be in power-inequitable relationships (aOR 1.77, 95% CI 1.08–2.92,
P
= 0.025) and be parents (aOR 4.30, 95% CI 2.16–8.57,
P
< 0.001). Adolescents reporting none of these factors had a 4% probability of secondary transmission risk, rising to 89% probability with all five identified factors. Older age and early sexual debut were also strongly associated with a higher risk of secondary HIV transmission.
Conclusion:
It is essential to identify and support AYPLHIV at a high risk of secondary transmission. Screening for factors such as mode of infection and parenthood during routine healthcare visits could help identify and provide resources to the most at-risk adolescents.