Absolute number of CD8⁺ T cells, CD4⁺ T cells, NK cells, and B cells in CMV-seropositive and CMV-seronegative patients awaiting renal transplantation. Comparison of absolute cell numbers in the PB of CMV-seropositive (♦, n = 430) and CMV-seronegative (■, n = 130) patients prior to transplantation. (A) CD8⁺ T cells; (B) CD4⁺ T cells; (C) NK cells; and (D) B cells. (E) Percentages of CMV pp65 YSE-, CMV IE ELR-, and CMV IE QIK–specific CD8⁺ T cells within total CD8⁺ T cells in 1 healthy subject.