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Methicillin-resistant Staphylococcus aureus in acute otitis externa

Maria J Duarte1,2, Elliott D Kozin1,2, Paulo J M Bispo3,4,5

  • 1Department of Otology and Laryngology, Harvard Medical School, Boston, MA, USA.

World Journal of Otorhinolaryngology - Head and Neck Surgery
|December 20, 2018
PubMed
Abstract

Insights

Methicillin-resistant Staphylococcus aureus (MRSA) is increasingly found in ear infections. This study found MRSA in 28.3% of Staphylococcus aureus ear infections, higher than historical rates.

Area of Science:

  • Otolaryngology
  • Infectious Diseases
  • Microbiology

Background:

  • Otologic methicillin-resistant Staphylococcus aureus (MRSA) infections were historically rare.
  • Rising community-acquired MRSA rates necessitate re-evaluation of its prevalence in ear infections.

Purpose of the Study:

  • To determine the prevalence of MRSA in recent otologic cultures from patients with acute otitis externa (AOE).

Main Methods:

  • Retrospective review of an institutional microbiologic database from January 2014 to April 2016.
  • Analysis of 173 patients diagnosed with AOE and undergoing ear cultures.
  • Identification of pathogens and antibiotic sensitivity via culture isolation and MIC testing; medical record review for patient characteristics.

Main Results:

  • Staphylococcus aureus (SA) was present in 30.6% of AOE cultures.
  • MRSA accounted for 28.3% of SA infections.
  • MRSA patients were older, had more comorbidities, and higher rates of prior topical antibiotic exposure compared to MSSA patients.

Conclusions:

  • Contemporary ear culture isolates show higher MRSA rates than historical data.
  • Clinicians should consider ear cultures for MRSA in acute otitis externa (AOE) cases.
Keywords:
Acute otitis externaMethicillin-resistant Staphylococcus aureus, MRSAStaphylococcus aureus

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