The proportion of patients with CMV viremia declines, whereas the proportion of patients without CMV viremia increases after transplantation. Patients at risk for CMV (n = 21) were analyzed at various time intervals after transplantation. This patient population included 16 patients who had positive anti-CMV antibody titers before transplantation and 5 patients who were negative for anti-CMV antibody titers but developed CMV viremia after transplantation. The proportion of patients with and without viremia among the tested population at risk is shown for each indicated time interval.