A 3-year-old boy is brought to the clinic by his parents due to ear pain and fever for the past day. He has been irritable and pulling at his right ear. He recently had an upper respiratory tract infection (URI) 3 days ago. His temperature is 101.8°F (38.8°C). On physical examination, he has rhinorrhea and a red, bulging right tympanic membrane with loss of the light reflex. Pneumatic otoscopy shows poor mobility of the tympanic membrane. Which of the following is the most likely diagnosis?
