5. Study catheter removal: A day 28 urine sample will be collected through the study catheter immediately prior to removal. Study catheters will be removed by study personnel at the MEDVAMC. Subjects who still have E. coli 83972 on the day of catheter removal will be given the option of taking antibiotics to eradicate the E. coli 83972 from the bladder or to remain colonized and in the follow-up phase of the study.