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The immune suppression inherent in allogeneic stem cell transplantation (SCT) offers a favorable environment for infection by opportunistic agents, such as human cytomegalovirus (CMV). Despite the application of potent antiviral prophylaxis, patients remain at risk for CMV infection until adequate immunity is restored. CMV-specific CD8(+) T cell counts were monitored, using HLA-A2 tetrameric complexes, to establish the level of immune response to the viral phosphoprotein UL83 in patients after allogeneic SCT. Correlating this with viral replication and clinical status shows that the level of tetramer-positive T cells provides an assessment of CMV immune reconstitution after stem cell transplantation. Most patients with seropositive donors did reconstitute long-term CMV immunity, unless prolonged immunosuppression to control graft-versus-host disease was induced. Together with polymerase chain reaction testing, this technique provides measurable parameters that can be a guide to therapeutic decision making and can form the basis of CMV immunotherapy.

Cytomegalovirus‐Specific Cellular Immune Responses and Viremia in Recipients of Allogeneic Stem Cell Transplants