Correlation between CD4 s₁ and CD8 s₁. Thirty-one sets of kinetics with VL > 50 copies/mL (A) and 16 sets of kinetics with VL < 50 copies/mL (B). ρ represents the Spearman rank correlation coefficient. A significant correlation is seen for patients with VLs > 50 copies/mL that is lost in patients with VL < 50 copies/mL.