IFNG and cytomegalovirus infection: The association of IFN-γ production in response to HCMV peptides with HCMV replication episodes and peripheral blood as the source of stem cells supports that posttransplant HCMV replication induces the expansion of IFN-γ producing HCMV-specific T cells present in the donor's peripheral blood, contributing to the control of HCMV infection.