i. An initial donation of 25ml blood anticoagulated with heparin or ACD. This blood is used to establish a B cell line transformed with the B95.8 laboratory strain of EBV. This EBV+ B cell line/ (EBVBLCL) will be used as an antigen-presenting cell. When loaded with the pool of CMVpp65 pentadecapeptides, the EBVBLCL efficiently sensitize T cells from the same donors against CMV as well as EBV.