- EBV viral load of > 10,000 copies per 106 peripheral blood mononuclear cells (PBMCs) as determined by quantitative polymerase chain reaction (qPCR). If there is any clinical suspicion that a subject who is EBV seronegative and with EBV PCR < 10,000 copies per 106 PBMCs has symptoms consistent with infectious mononucleosis prior to administration of study treatment, then a monospot test result must be negative before the subject can be enrolled.