<prompt> Most common organism involved in urinary catheter induced urinary tract infection is -E.coliPseudomonasStaphylococcus epidermidisProteus  <response>: Most commonly involved organism in causing urinary tract infection is E. Coli. Risk factors - More common in females Recent use of a diaphragm with spermicide, frequent sexual intercourse. Maternal history of diabetes ,UTI and incontinence . Obstruction in urine flowcalculi,malignancies Incomplete voidingresidual urine Foriegn body in urinary tract catheter, calculi Ref:Harrison 20 th edition pg no 969,970 