Cytomegalovirus infection and specific cell-mediated immunity after marrow transplant.

Patients were studied prospectively after marrow transplant to correlate cytomegalovirus (CMV) infection with the in vitro lymphocyte transformation response to CMV antigen. Ninety-two (58%) of 158 patients developed CMV infection. The lymphocyte response to CMV antigen of patients who were seropositive before transplant was significantly suppressed immediately after transplant. Isolation of CMV was associated with further suppression of responses; seroconversion to CMV was associated with a significant increase. The lymphocyte response of 73 long-term survivors was similar to that of normal persons. The presence of antibody to CMV in the donor before transplant had little effect on the lymphocyte response of patients after transplant even though the patients' lymphocyte s were of donor origin. As in previously reported studies of immunity to other herpesviruses after marrow transplant, it was concluded that recovery of the response to CMV antigen is related primarily to active virus infection and not to patient or donor pretransplant immunity.