Which pathogens cause otitis externa (OE)?

Updated: Mar 09, 2020
  • Author: Ariel A Waitzman, MD, FRCSC; Chief Editor: Ravindhra G Elluru, MD, PhD  more...
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OE is most often caused by a bacterial pathogen; other varieties include fungal OE (otomycosis) and eczematoid (psoriatic) OE. [12] In one study, 91% of cases of OE were caused by bacteria. [7] Others have found that as many as 40% of cases of OE have no primary identifiable microorganism as a causative agent. The most common causative bacteria are Pseudomonas species (38% of all cases), [12] Staphylococcus species, and anaerobes and gram-negative organisms.

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