The study is to investigate whether chlorhexidine (CHG)-based antiseptics is more effective to prevent catheter-related urinary tract infection (CAUTI) among inhospital patients who required Foley catheter insertion. This is a cluster-randomised, step-wedged clinical trial, in which every participated unit will used three different Foley catheter insertion protocols during the study period: 1. Iodine protocol: using 10% povidone-iodine as the primary antiseptic during Foley insertion. This is the routine practice before this study in the participated hospital, as well as many Taiwanese hospitals. 2. CHG protocol: instead of povidone-iodine solution, use 2% aqueous CHG solution as the primary disinfectant during Foley solution. 3. CHG plus protocol: additional to 2% CHG solution, added 0.5% CHG impregnated gel as the lubrication during Foley insertion.
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Incidence of catheter-related urinary tract infection
Timeframe: During the entire observation period (12 months)