Sandbox:Otitis externa causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.

Causes

Causes of otitis externa include all sources of inflammation of the external ear canal.

Bacterial

• The primary bacterial infectious causes of otitis externa are the following:
  • Pseudomonas aeruginosa
  • Staphylococcus aureus
• Additional bacterial causes include the following:
  • Staphylococcus epidermidis
  • Microbacterium otitidis
  • Microbacterium alconae
  • Staphylococcus caprae
  • Staphylococcus auricularis
  • Enterococcus faecalis
  • Enterobacter cloacae
  • Staphylococcus capitis
  • Staphylococcus haemolyticus
• Infectious bacteria that thrive in water can cause otitis externa due to facilitated transport to the ear canal.