A 3-Year-Old Boy Is Brought to the Clinic Due to Left

A 3-year-old boy is brought to the clinic due to left ear pain over the past 3 days.  Last week, the patient developed a runny nose and cough, which resolved 2 days prior to the development of ear pain.  He has no chronic medical conditions.  Temperature is 38.4 C (101.1 F) .  There is purulent drainage from the left ear.  Otoscopic examination of the left ear reveals a normal-appearing external canal and an erythematous tympanic membrane with purulent fluid pooling within the distal external canal.  Which of the following organisms is the most likely cause of this patient's diagnosis?

A) Klebsiella pneumoniae
B) Moraxella catarrhalis
C) Proteus mirabilis
D) Pseudomonas aeruginosa
E) Staphylococcus aureus
F) Streptococcus pneumoniae

Correct Answer:

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