A 22-year-old sexually active woman presents to the clinic with a 3-day history of dysuria, urinary frequency, and lower abdominal discomfort. She denies fever, chills, or flank pain. Her past medical history is unremarkable, and she reports no previous urinary tract infections. Physical examination reveals mild suprapubic tenderness without costovertebral angle tenderness. A urinalysis shows pyuria, bacteriuria, and microscopic hematuria. A urine culture grows Staphylococcus saprophyticus. Which of the following characteristics differentiates Staphylococcus saprophyticus from other coagulase-negative staphylococci?
