Study of Posoleucel (ALVR105,Viralym-M) for Multi-Virus Prevention in Patients Post-Allogeneic Hematopoietic Cell Transplant

Key Inclusion Criteria:

* Any age at the day of screening visit.
* No known or suspected clinically significant disease from AdV, BKV, CMV, EBV, HHV-6, and/or JCV
* Within 25 days of receiving a first allogeneic HCT and have demonstrated clinical engraftment at time of dosing
* Meet one or more of the following criteria at the time of randomization:

* Related (sibling) donor with at least one mismatch at one of these HLA-gene loci: HLA-A, -B or -DR
* Haploidentical donor
* Matched or Mismatched unrelated donor
* Use of umbilical cord blood as stem cell source
* Ex vivo graft manipulation resulting in T cell depletion
* Received anti-thymocyte globulin or alemtuzumab (Campath-1H)

Key Exclusion Criteria:

* History of AdV, BKV, CMV, EBV, HHV-6, and/or JCV end-organ disease within 6 months prior to randomization
* Evidence of active Grade \>2 acute GVHD
* Presence of non-minor uncontrolled or progressive bacterial, viral or fungal infections
* Known history or current (suspected) diagnosis of Grade ≥3 CRS requiring treatment associated with the administration of peptides, proteins, and/or antibodies
* Ongoing therapy with high-dose systemic corticosteroids (ie, prednisone equivalent dose \>1.0 mg/kg/day) within 24 hours prior to dosing
* Relapse of primary malignancy other than minimal residual disease

Note: Other protocol defined Inclusion/Exclusion criteria may apply.