Urinary tract infections can affect all of the following except?

Urinary tract infections (UTIs) commonly involve specific parts of the urinary system, which includes the bladder, urethra, and kidneys. Each of these structures can be affected by bacterial infections that lead to inflammation and other symptoms associated with UTIs.

The bladder is often the primary site of a UTI, where bacteria can multiply and cause cystitis. The urethra can also be affected, as it serves as the channel through which urine passes out of the body, making it susceptible to infection. The kidneys, involved in filtering blood and producing urine, can become involved in more serious cases, leading to pyelonephritis, an infection of the kidney itself.

In contrast, the stomach is part of the digestive system and does not play a role in the urinary system. Therefore, it does not become infected in the context of a UTI, making it the exception in this case. Understanding the anatomy and physiology of the urinary system clarifies why the stomach is not affected by urinary tract infections.