I t’s one of the most common misdiagnoses in American medicine, and it usually happens like this: An old and frail person gets confused, tired, or a little dizzy. Maybe she just doesn’t feel like eating. Or she stumbles. These are classic geriatric syndromes that usually receive a classic medical response: the senior is ordered to pee in a cup for testing. The leading suspect is a urinary tract infection. Too often, it’s the wrong suspect. The urinary tract infection (UTI), has become the