CD4 and infection: Notably, among all infections, FoxP3+ T cells (Tregs and CD25-FoxP3+ cells) showed a higher proportion (0.5%–1%) than effector CD4+ T cells (Th1 and Th17; <0.5%) relative to the overall CD4+ αβ T cell population (3%–5%) at 14 dpi (Fig. 6C).