This phase II trial studies how well multi-peptide CMV-modified vaccinia Ankara (CMV-MVA Triplex) vaccination of stem cell donors works in preventing cytomegalovirus (CMV) viremia in participants with blood cancer undergoing donor stem cell transplant. Giving a vaccine to the donors may boost the recipient's immunity to this virus and reduce the chance of CMV disease after transplant.
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Delayed Engraftment
Timeframe: Up to 1 year from stem cell infusion.
Severe (Grade III-IV) Acute Graft Versus Host Disease
Timeframe: Up to 6 months from stem cell infusion
Number of Recipients With Grade 3-4 Adverse Events
Timeframe: Up to 1 year from stem cell infusion.
Number of Donors With Grade 2-3 Adverse Events
Timeframe: Up to 6 months after G-CSF mobilization
100-Day Non-Relapse Mortality (NRM)
Timeframe: From stem cell infusion up to 100 days post-HSCT (hematopoietic stem cell transplantation).