A nurse is caring for a 3-year-old client who has been diagnosed with a urinary tract infection and is prescribed amoxicillin/clavulanate. Which of the following pathogens should the nurse identity as the most common bacterial cause of UTIs?

A. Enterococcus can cause UTIs, especially in hospitalized or catheterized patients, but it is not the most common cause in otherwise healthy children. B. Escherichia coli (E. coli) is by far the most common pathogen responsible for pediatric urinary tract infections. It accounts for approximately 80–90% of all UTIs in children. The bacteria originate from the gastrointestinal tract and ascend through the urethra into the urinary tract, making it the leading cause. C. Pseudomonas aeruginosa is less common and usually associated with complicated UTIs, such as those in children with structural abnormalities, indwelling catheters, or immunocompromised states. D. Klebsiella can also cause UTIs but occurs far less frequently compared to E. coli.