Which statement best defines a urinary tract infection (UTI)?

Which statement best defines a urinary tract infection (UTI)?

• A. Infection of any region of the urinary tract, typically presenting with fever, low back or abdominal pain, and burning during urination.
• B. Inflammation of the bladder caused solely by chemical irritants.
• C. Infection limited to the external genitalia.
• D. A viral infection of the urinary tract.

Answer: (A)

UTIs are infections of any part of the urinary tract caused by microbes, most commonly bacteria. The statement that describes infection in any region of the urinary tract and notes symptoms like burning during urination along with fever and back or abdominal pain fits the typical spectrum, since lower tract infections cause dysuria and frequency, while upper tract involvement (pyelonephritis) can bring fever and flank or abdominal pain. This broad definition is what makes it the best answer. The other descriptions point to conditions that are not urinary tract infections: chemical cystitis is inflammation from irritants rather than infection; infection limited to external genitalia does not involve the urinary tract itself; and viral infections are not the usual cause of UTIs, which are predominantly bacterial (with rare fungal possibilities).

UTIs are infections of any part of the urinary tract caused by microbes, most commonly bacteria. The statement that describes infection in any region of the urinary tract and notes symptoms like burning during urination along with fever and back or abdominal pain fits the typical spectrum, since lower tract infections cause dysuria and frequency, while upper tract involvement (pyelonephritis) can bring fever and flank or abdominal pain. This broad definition is what makes it the best answer. The other descriptions point to conditions that are not urinary tract infections: chemical cystitis is inflammation from irritants rather than infection; infection limited to external genitalia does not involve the urinary tract itself; and viral infections are not the usual cause of UTIs, which are predominantly bacterial (with rare fungal possibilities).