Acute otitis media is most commonly caused by Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis, with high-dose amoxicillin as the standard therapy. Which condition is this description most consistent with?

Acute otitis media is most commonly caused by Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis, with high-dose amoxicillin as the standard therapy. Which condition is this description most consistent with?

• A. Otitis externa
• B. Acute otitis media
• C. Sinusitis
• D. Mastoiditis

Answer: (B)

Recognize that this item is about acute otitis media, defined by infection of the middle ear caused by the classic pathogens S. pneumoniae, H. influenzae, and M. catarrhalis. The standard first-line therapy is high-dose amoxicillin, chosen to cover penicillin-resistant pneumococcus and the common beta-lactamase–producing strains of H. influenzae and M. catarrhalis. This combination of middle-ear infection with these organisms and the recommended antibiotic fits acute otitis media precisely. Otitis externa involves the ear canal and is treated with topical agents for different bugs (like Pseudomonas); sinusitis targets the sinuses and, while it can share similar organisms, the site and management differ; mastoiditis is a possible complication of AOM requiring more intensive therapy and evaluation.

Recognize that this item is about acute otitis media, defined by infection of the middle ear caused by the classic pathogens S. pneumoniae, H. influenzae, and M. catarrhalis. The standard first-line therapy is high-dose amoxicillin, chosen to cover penicillin-resistant pneumococcus and the common beta-lactamase–producing strains of H. influenzae and M. catarrhalis. This combination of middle-ear infection with these organisms and the recommended antibiotic fits acute otitis media precisely. Otitis externa involves the ear canal and is treated with topical agents for different bugs (like Pseudomonas); sinusitis targets the sinuses and, while it can share similar organisms, the site and management differ; mastoiditis is a possible complication of AOM requiring more intensive therapy and evaluation.