Then the intervention period are three months (from June to August), and the last four months(from September to December) are the analysis and evaluation period. In the baseline period, we only do the patient's active surveillance and environmental culture. In the intervention period, beside the patient's active surveillance and environmental culture, we add contact precaution as the infection control method. If patient has VRE infection, we prescribe appropriate antibiotic therapy until the culture result proved no growth of VRE.