1. Preparation of study catheters: Urinary catheters will be incubated in broth with E. coli 83972 for 48 hours prior to insertion into patients. Samples of broth will be removed after 24 hours and 48 hours of incubation to test for purity of the E. coli 83972. Study catheters will be inserted after 48 hours of incubation, unless contamination was seen on the 24-hour plates. The 48-hour plates will be read at 72 hours, and any contamination would prompt removal of the study catheter. For subjects who require antibiotics to clear their bladders prior to catheter insertion, we will use a derivative strain of E. coli 83972 with the appropriate antibiotic resistance.