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Microbiology and antimicrobial susceptibility of otitis externa: a changing pattern of antimicrobial resistance

  • E Heward (a1), M Cullen (a2) and J Hobson (a1)
Abstract
Objective:

Otitis externa is a common presentation to secondary care otolaryngology clinics. Despite this, few studies have investigated the microbiology and antimicrobial resistance of otitis externa. This study aimed to examine these issues.

Methods:

Analysis identified 302 swabs taken from 217 patients (100 male, 117 female), between 1 January 2015 and 30 March 2016, at our rapid access otolaryngology clinic.

Results:

In total, 315 organisms were isolated; the most frequent was Pseudomonas aeruginosa (31.1 per cent), followed by candida species (22.9 per cent) and Staphylococcus aureus (11.7 per cent). P aeruginosa was sensitive to ciprofloxacin in 97.7 per cent of cases and to gentamicin in 78.4 per cent.

Conclusion:

Compared with studies worldwide, the relative proportions of different organisms causing otitis externa and the patterns of antimicrobial resistance differ. Increasing resistance of P aeruginosa to aminoglycosides demonstrates a changing pattern of antimicrobial resistance that has not been previously reported. Reassuringly, quinolone antibiotics remain highly effective when treating P aeruginosa.

Copyright
Corresponding author
Address for correspondence: Mr Elliot Heward, Department of Otolaryngology, University Hospital of South Manchester NHS Foundation Trust, Manchester, UK E-mail: elliotheward@doctors.org.uk
Footnotes
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Presented orally at the International Federation of ORL Societies (‘IFOS’) World ENT Congress, 26 June 2017, Paris, France.

Footnotes
References
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The Journal of Laryngology & Otology
  • ISSN: 0022-2151
  • EISSN: 1748-5460
  • URL: /core/journals/journal-of-laryngology-and-otology
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