Follow-up of total and HCMV-specific CD4⁺ T-cell reconstitution. Absolute number of total and of HCMV-specific CD4⁺ T cells during the first year after transplantation in the 2 groups of HCMV-seropositive (R⁺; A, C) and -seronegative (R^–; B, D) recipients.