v. Under treatment for a medical condition requiring chronic use of steroids at a dose > prednisone 5 mg/day w. Use of coumadin or other anticoagulant therapy (except aspirin) or subject with PT INR > 1.5 x. Addison's disease.y. EBV- negative subjects (use EBNA test for screening) to reduce potential risk of EBV infection for previously unexposed recipient.