Once the EBV-CTLs are ready and the patient has recovered from the last round of chemotherapy, the EBV-CTL infusion will be scheduled. The CTL infusion will take place at either Houston Methodist Hospital or Texas Children's Hospital. The CTL infusion takes about 1 to 5 minutes, but patients are typically monitored for up to 4 hours after the infusion to make sure that he/she does not have a reaction to the cells.