Otitis externa


Appropriate Tests


Ear swab may be indicated when infection is severe or recurrent or when simple therapeutic measures are not successful.



  • Staphylococcus aureus


  • Pseudomonas aeruginosa


'Malignant' otitis externa

Osteomyelitis of the petrous temporal bone, usually in patients with Diabetes mellitus and often caused by Pseudomonas aeruginosa: MCS pus (Ear swab) - microscopy and culture.

Bone biopsy, MCS pus from operative debridement (microscopy and culture). Blood culture; Full blood count; Glucose.

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