aInfectious Diseases, Department of Medicine

bInfection Control, Division of Quality and Safety

cLymphoma Service, Division of Hematologic Malignancies, Department of Medicine

dHuman Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, New York, USA

Correspondence to Santosha A. Vardhana, MD, PhD, 417 E 68th Street, ZRC-803, New York, NY10065, USA. Tel: +646-888-2706; e-mail: [email protected]