RESULTS	Three patients in each treatment arm ( 100 day : 3/163 ( 1.8 % ) vs 200 day : 3/155 ( 1.9 % ) ) had a single known valganciclovir resistance mutation detected ( 100 day : UL97 gene : M460V , C592G twice ; 200 day : UL97 gene : C603W , M460V and UL54 gene : P522S ) .\