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Optimal site for throat culture: tonsillar surface versus posterior pharyngeal wall

E L van der Veen1, E A M Sanders, W J M Videler

  • 1Department of Otorhinolaryngology (E 04.140.5), Wilhelmina Children's Hospital, University Medical Center Utrecht, PO Box 85090, 3508 AB, Utrecht, The Netherlands. a.schilder@wkz.azu.nl

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
|May 5, 2006
PubMed

Insights

For detecting Group A beta-hemolytic streptococci in sore throat patients, sampling tonsillar surfaces is sufficient. However, to identify other potential respiratory pathogens like Haemophilus influenzae, posterior pharyngeal wall cultures are also recommended.

Area of Science:

  • Otolaryngology
  • Microbiology
  • Pediatrics

Background:

  • Accurate pathogen detection is crucial for diagnosing upper respiratory conditions in children.
  • Throat cultures are a primary diagnostic tool, but optimal sampling sites remain debated.

Purpose of the Study:

  • To compare the efficacy of tonsillar surface versus posterior pharyngeal wall cultures for identifying respiratory pathogens in children.
  • To determine the best throat culture site for detecting specific bacteria, including Group A beta-hemolytic streptococci and Haemophilus influenzae.

Main Methods:

  • A comparative study involving 100 children: 50 undergoing adenotonsillectomy and 50 healthy controls.
  • Cotton swabs collected simultaneous cultures from tonsillar surfaces and the posterior pharyngeal wall.
  • Microbiological analysis identified potential respiratory pathogens.

Main Results:

  • Posterior pharyngeal wall cultures yielded significantly more positive results (67/100) than tonsillar surface cultures (47/100).
  • Haemophilus influenzae was most frequently isolated from both sites, with higher prevalence on the posterior pharyngeal wall (55%) compared to tonsils (35%).
  • Group A beta-hemolytic streptococci detection rates were similar between the posterior pharyngeal wall (17%) and tonsillar surfaces (13%).

Conclusions:

  • Tonsillar surface cultures alone are adequate for detecting Group A beta-hemolytic streptococci in sore throat patients.
  • For comprehensive pathogen identification, including Haemophilus influenzae, especially in research settings, sampling the posterior pharyngeal wall is recommended.

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