Temporary loss of T cell immunity towards various virus infections (e.g. Cytomegalovirus (CMV), Epstein Barr Virus (EBV) or Adenovirus (AdV)) is a main cause of infection-related mortality in severely immunocompromised patients, like individuals upon allogeneic hematopoetic stem cell transplantation (HSCT). Adoptive transfer of virus-specific T cells (ACT) from seropositive HSCT [...]