Influenza Vaccination in Bone Marrow Transplantation

Inclusion Criteria: * Patients were included if they had received RIC allo HSCT 3 months or more prior to enrollment, and were between the age of 18 and 65 years. * Controls were health care providers at our institution, between the ages of 18 and 65 years, who were in good health, and who are routinely offered influenza vaccination. Exclusion Criteria: * Patients were excluded if they failed to engraft, or had relapse of the underlying disease requiring chemotherapy or immunotherapy. * Patients and controls were also excluded if they had history of egg allergy, acute febrile illness at the time of vaccination, or influenza-like illness within 4 weeks prior to vaccination.