This study will last 1 year. There are no study visits. The placement and removal of the catheter will be determined by the discretion of the attendant caring for the participant. Participants will be randomly assigned to one of two groups. Catheters of Group 1 participants will be treated with 3.15% chlorhexidine at the time of the daily intravenous tubing change. Catheters of Group 2 participants will be treated with isopropyl alcohol. For both groups, cultures of the inner surface of the catheter hub will be performed twice a week, and cultures of the inner surface of the catheter hub, tip, and skin insertion site will be performed upon removal of the catheter.