(A) Representative flow cytometry sorting strategy for HIV multimer+ CD8+ T cells. (B) Boxplots of pairwise Pearson correlations for data from individual donors within each biological condition. Centre, median; box limits, first and third percentiles; whiskers, min and max. N = 11 donors. (C) Combined principal component analysis of naïve, HIV-, HCV- and Flu- specific CD8+ T cells from the HIV and HCV cohorts.