67-year-old woman has frequency and dysuria.
She has hypertension for which she takes a beta-blocker, but no other medical problems. She states that she is not sexually active. She does not smoke and drinks cranberry juice daily. Examination shows mild suprapubic tenderness and genital atrophy but is otherwise unremarkable. Urinalysis shows 50-100 leukocytes/hpf and 8 RBC/hpf. Which of the following is the most likely cause of the infection?
a) Cardiac disease
b) Cranberry juice ingestion
e) Sexual intercourse