<qa>  How long will the blood last in the body?Patients will be followed in the clinic after the injections. To learn more about the way the T cells are working and how long they last in the body, an extra 40 mls 8 teaspoonfuls of blood will be taken before each infusion and then 24 hours after each infusion, 3-4 days after each infusion and at 1, 2, 4, and 6 weeks post infusion and then at 3, 6, 9 and 12 months post infusion. The blood may be drawn from the central line at the time of regular blood tests. This blood will be used to test for the frequency and activity of EBV specific T cells. A total of at least 122 teaspoons approximately 40 tablespoons of blood will be collected during participation in this study. 