Otitis externa

Otitis externa is a topic covered in the Guide to Diagnostic Tests.

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Organism

Otitis externa

Acute localized: S. aureus (15%) (GPC), anaerobes (32%), S. pyogenes (GPC in chains), H. influenzae , other gram-positive cocci.

“Swimmer’s ear”: Pseudomonas sp. (40%) (GNR), fungi (6%) (eg, Aspergillus sp., Candida sp.).

Chronic: Usually secondary to seborrhea or eczema.

Diabetes mellitus, AIDS (“malignant otitis externa”): P. aeruginosa (GNR), Aspergillus sp., Candida sp.

Furuncle of external canal: S. aureus.

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Organism

Otitis externa

Acute localized: S. aureus (15%) (GPC), anaerobes (32%), S. pyogenes (GPC in chains), H. influenzae , other gram-positive cocci.

“Swimmer’s ear”: Pseudomonas sp. (40%) (GNR), fungi (6%) (eg, Aspergillus sp., Candida sp.).

Chronic: Usually secondary to seborrhea or eczema.

Diabetes mellitus, AIDS (“malignant otitis externa”): P. aeruginosa (GNR), Aspergillus sp., Candida sp.

Furuncle of external canal: S. aureus.

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