A 6-year-old child has been running a fever of 37-38 degrees for three consecutive days, with no improvement after three days of injection therapy. Blood tests show a white blood cell count of 17,000. After six days of intravenous treatment (including penicillin and ceftriaxone), the count dropped to 10,000, but the body temperature remains unstable and fever-reducing medication is needed. Inquire about possible causes and coping measures.