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Published on: January 20, 2011

Tympanostomy tube in vitro biofilm potential of common otopathogens

Carolyn Ojano-Dirain1, Patrick J Antonelli

  • 1Department of Otolaryngology, University of Florida, Gainesville, Florida 32610-0264, USA. Carolyn.Ojano-Dirain@ent.ufl.edu

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|February 29, 2012
PubMed
Abstract

Insights

Staphylococcus aureus and Pseudomonas aeruginosa readily form biofilms on tympanostomy tubes, potentially explaining persistent ear infections. Other common pathogens like Haemophilus influenzae and Streptococcus pneumoniae show varied biofilm formation capabilities.

Area of Science:

  • Otolaryngology
  • Microbiology
  • Biomaterials Science

Background:

  • Post-tympanostomy tube otorrhea is a common complication linked to microbial biofilms.
  • Understanding the biofilm-forming capacity of key otopathogens is crucial for managing this condition.

Purpose of the Study:

  • To compare the in vitro biofilm-forming propensity of Pseudomonas aeruginosa, Staphylococcus aureus, Haemophilus influenzae, and Streptococcus pneumoniae on tympanostomy tube materials.

Main Methods:

  • Controlled in vitro study using fluoroplastic coupons exposed to bacterial cultures for 2, 4, and 7 days.
  • Half of coupons were treated with antibiotics to assess planktonic vs. biofilm bacteria.
  • Total and biofilm colony counts, along with electron microscopy, were utilized for analysis.

Main Results:

  • Staphylococcus aureus exhibited rapid biofilm formation and high tolerance to antibiotics.
  • Pseudomonas aeruginosa formed biofilms quickly, plateauing by day 4.
  • Haemophilus influenzae and Streptococcus pneumoniae (with catalase) showed delayed or strain-dependent biofilm formation.

Conclusions:

  • Staphylococcus aureus and Pseudomonas aeruginosa are the most proficient biofilm formers on tympanostomy tubes.
  • These findings may help explain the refractory nature of otorrhea caused by these specific pathogens.
  • Further research is warranted to elucidate the clinical implications of these biofilm dynamics.

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