A 10-year-old boy is seen in your clinic with his grandmother due to right ear pain. His grandmother informs you that the boy is part of the school’s swimming team

A 10-year-old boy is seen in your clinic with his grandmother due to right ear pain. His grandmother informs you that the boy is part of the school’s swimming team. Physical examination reveals tragal tenderness, palpable tender lymphadenopathy in the right periauricular region with associated swelling of the pinna and periauricular skin. Tympanic membrane cannot be visualized due to ear canal swelling. Which of the following etiologic agents is the most common cause of the patient’s condition? Moraxella catarrhalis Nontypeable Haemophilus influenzae Pseudomonas aeruginosa Streptococcus pneumoniae