How can urinary bladder catheterization cause infection?

Answer:
There may be bacteria in or around the urethra but they normally cannot enter the bladder. A catheter can pick up bacteria from the urethra and allow them into the bladder, causing an infection to start
First answer by Gale Ency. of Medicine. Last edit by Gale Ency. of Medicine. Contributor trust: 36 [recommend contributor recommended]. Question popularity: 1 [recommend question].