RecruitingPhase 2Drug trialShingrix In Recipients of Allogeneic TransplantsThis research is designed to determine if the adjuvanted recombinant glycoprotein E (gE) herpes zoster (HZ) vaccine (Shingrix) has acceptable immunogenicity and safety in people who have undergone allogeneic stem cell transplant (allo-SCT). Specifically, it will determine the effect of the interval after transplantation on the immune response and if an additional dose of vaccine is needed to improve the vaccine-induced responses.