Correlation between the percentage of cytokine-secreting CD4 T cells in blood and viremia. (A) Total IFN-γ-secreting CD4 T cells. (B) Single IFN-γ-secreting CD4 T cells. (C) Correlation between the percentage of total (single IL-2- plus IL-2/IFN-γ-secreting cells) IL-2-secreting cells and viremia. (D) Correlation between the percentage of single IL-2-secreting cells and viremia. (E) Correlation between the percentage of IL-2/IFN-γ-secreting cells and viremia. The regression lines are shown. A 2-tailed P < .05 was considered significant.