CD4 and infection: This model found infection with a non-clade B strain (relative risk ratio (RRR): 5.83, 95% confidence interval (95% CI): 2.15–15.88), a CD4+ T cell count below 200 μl−1 (RRR: 2.71, 95% CI: 1.16–6.32), being off ART at study inclusion (RRR: 5.00, 95% CI: 2.13–11.73) and a longer period of being off ART before study inclusion regardless of the current ART status (RRR: 5.52, 95% CI: 2.11–14.44) to be strong independent predictors for neutralization activity (Fig. 3b).