Problem: Which of the following patients with a confirmed first incidence of a urinary tract infection requires further imaging studies?
A - A 6-month-old female who is febrile after 48 hours of antibiotic treatment
B - A6-month-old male who remains febrile after 72 hours of antibiotic treatment
C - A 3-year-old female who is febrile after 48 hours of antibiotic treatment
D - A 4-year-old male who is febrile after 72 hours of antibiotic treatment