This blood will be used to grow an EBV-infected B-cell line and then a T-cell line. B cells and T cells are types of white blood cells that help fight infections in the body. After growing T cells in the laboratory, these cells will be stimulated with EBV infected B cells. The B cells have been treated with radiation so they cannot grow; however, they can provide the stimulation that will train the T cells to recognize and kill EBV infected cells.