The patient has contracted a urinary tract infection (UTI) while in the hospital. Which action will $\mathbf{most}$ likely increase the risk of a patient contracting a UTI?

A) Reusing the patient's graduated receptacle to empty the drainage bag.
B) Allowing the drainage bag port to touch the graduated receptacle.
C) Emptying the urinary drainage bag at least once a shift.
D) Irrigating the catheter infrequently.

Allowing the urinary drainage bag port to touch contaminated items (graduated receptacle) may introduce bacteria into the urinary system and contribute to a urinary tract infection. The urinary drainage bag should be emptied at least once a shift. Patients should have their own receptacle for measurement to prevent cross-contamination. Repeated catheter irrigations increase the chance so irrigating infrequently will be beneficial in reducing the risk.