Effector-memory (EM) T cells show a higher Th1 and lower Th2 phenotype in patients with CMV viremia after aHSCT. PBMCs were stained with fluorophore-conjugated antibodies and analyzed by flow cytometry. In (A) the gating strategy is depicted in one representative example. (B) Th1 and Th2 phenotypes of EM CD4+ T cells before and at 1, 3, 6, and 12 months after aHSCT. For CMV viremia group, n = 5, 5, 4, 5, 4, for no CMV viremia group, n = 21, 16, 15, 22, 21. To detect significant differences, an unpaired Wilcoxon signed-rank test was used, significance levels were * for p ≤ 0.05, and ** for p ≤ 0.01.