Problem: A 5-year-old girl developed high fever, ear pain, and vomiting a week ago. She was diagnosed with OM and started on amoxicillin-clavulanate. On the third day of this medication, she continued with findings of OM, fever, and pain. She received ceftriaxone intramuscularly and switched to oral cefuroxime. Now, 48 hours later, she has fever, pain, and no improvement in her OM; otherwise, she is doing well. Which of the following is the most logical next step in her management? A Addition of intranasal topical steroids to the oral cefuroxime B Adenoidectomy C Addition of otic drops to current antibiotic regimen D Oral trimethoprim-sulfamethoxazole E Tympanocentesis and culture of middle ear fluid