system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 25-year-old woman presents to the clinic with complaints of dysuria and increased urinary frequency. Her urinalysis results are negative for nitrites. Urine microscopy shows the findings in figure A.

What is the most likely cause underlying her symptoms?
assistant
S. saprophyticus infection