This study aims to reduce the duration of VRE intestinal carriage by the administration of Lactobacillus casei rhamnosus (strain Lcr 35 LC). Patients will be blindly randomized to be assigned to a 5 weeks regimen with the probiotic (10 9 lactobacillus bid) or to a 5 weeks regimen with placebo.A stool culture will be performed every week for 5 weeks (during the administration of treatment) then every two weeks until 3 consecutive negative stool culture for VRE.