Approximately two-thirds of the uropathogens that cause CA-bacteriuria in patients with indwelling urethral catheters are extraluminally acquired (by ascension along the catheter urethral mucosa interface), and one-third are intraluminally acquired.

Gram positive cocci	Gram negative bacilli	Fungi
Staphylococcus aureus Coagulase negative Staphylococcus Enterococcus faecalis/ E. faecium	Escherichia coli Klebsiella species Pseudomonas species Proteus mirabilis Morganella morganii Enterobacter species Aceinatobacter species	Candida species