A 28 year-old woman presents with a 2-day history of urinary frequency, urgency and dysuria, stating, “This feels like when I had a urine infection 4 years ago.” She denies fever or GI upset and otherwise feels well. In consideration of the diagnosis of lower UTI/cystitis, a urinalysis is ordered. Which of the following is the most sensitive and specific finding for UTI caused by a Gram-negative organism?A. Positive leukocyte esteraseB. Presence of bacteriuriaC. ProteinuriaD...