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1 results

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

  • E Heward, M Cullen, J Hobson
  • Journal:
    The Journal of Laryngology & Otology / Volume 132 / Issue 4 / April 2018
    Published online by Cambridge University Press:
    12 February 2018, pp. 314-317
    Print publication:
    April 2018
  • 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.