A 35-year-old woman presents with frequency, urgency, and dysuria for 5 days, fever (39.5°C), left costovertebral angle tenderness. Urinalysis shows protein (++), WBCs covering the field, and 5-10 RBCs/HPF. The most likely diagnosis is:
A 35-year-old woman presents with frequency, urgency, and dysuria for 5 days, fever (39.5°C), left costovertebral angle tenderness. Urinalysis shows protein (++), WBCs covering the field, and 5-10 RBCs/HPF. The most likely diagnosis is: