CD4 and viral infectious disease: Quantification of TCRs with known specificities for Cytomegalovirus (CMV) or Epstein–Barr virus (EBV) both being responsible for common post-transplant viral infections showed that the number of virus-specific T-cells was comparable between the two treatment groups and remained stable over time (CMV: CD4: F(3, 24) = 0.76 p = 0.530; CD8: F(3, 24) = 0.27 p = 0.849; EBV: CD4: F(3, 24) = 1.64 p = 0.206; CD8: F(1.13, 9.03) = 1.32 p = 0.287).