Methods: Kaplan-Meier product limit estimates for median time to CMV disease for both treatment groups will be used, and a Kaplan-Meier survival curve will be plotted to compare treatment difference. Kaplan-Meier product limit estimates for median time to CMV resistance for both treatment groups will be used, and a Kaplan-Meier survival curve will be plotted to compare treatment difference. In addition, the Cox regression will be performed to compare treatment groups using treatment as a covariate in the model.