53) A 4-year-old is brought to your office by his mother for e | Paediatrics videos & books

53) A 4-year-old is brought to your office by his mother for evaluation. She is concerned because the child has been spiking fevers and pulling on his left ear. Your examination reveals a bulging and erythematous tympanic membrane (TM).
Which of the following is most likely to be the cause of his illness?