H0 Treatment with Certican® (everolimus) in combination with valcyte® (valganciclovir) or cymevene® (ganciclovir) is equal to valcyte® (valganciclovir) or cymevene® (ganciclovir) alone in reducing the CMV-load in renal transplant patients with CMV-disease H1: Treatment with Certican® (everolimus) in combination with valcyte® (valganciclovir) or cymevene® (ganciclovir) is superior to valcyte® (valganciclovir) or cymevene® (ganciclovir) in reducing CMV load (copies/mL) in renal transplant patients with CMV-disease Type-I and -II errors - power. α=0.05 ß=0.2 (power 0.8) Statistical methodology ANOVA of repeated measures (CMV-copies/mL), one-sided t-test of CMV load at distinct time-points, one-sided t-test of the time (in weeks) until CMV-load reaches ≤600 copies/mL Sample size calculation Based on a one-sided testing and a σ of 0.2 in relative changes of CMV-copies, an α=0.05 And a ß=0.2 a sample size of 20 patients per group was determined. Main analysis set Per-protocol (efficacy) and intention to treat (ITT) for safety Other endpoints Bonferroni corrected t-tests will be performed for CMV-copies/mL at each time point of the follow-up period. The time to copies ≤ 600 will also be analyzed by a t-test. All other secondary endpoints and subgroup analysis will be performed in explorative intention (descriptive statistics).