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Related Concept Videos

Chronic Pharyngitis01:23

Chronic Pharyngitis

Chronic pharyngitis refers to persistent inflammation of the pharyngial mucosa.
Etiology
It often arises from persistent viral or bacterial infections affecting sinuses and tonsils.
Additional contributing factors include inadequate dental hygiene, mouth breathing, recurring tonsillitis, allergic rhinitis, laryngopharyngeal reflux, and exposure to smoke, chemicals, and other environmental pollutants. Allergic reactions to pollen, mold, and pet dander, chronic cough, excessive voice usage,...
Tonsillitis II: Management01:26

Tonsillitis II: Management

This lesson will focus on the different treatment options for managing tonsillitis, which typically depend on the cause and severity.
Development of the Oral Microbiota01:28

Development of the Oral Microbiota

The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
Microbiota of the Respiratory Tract01:29

Microbiota of the Respiratory Tract

The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more like...
The Oral Microbiota01:27

The Oral Microbiota

The oral microbiome includes a complex ecosystem comprising over 700 microbial species, identified through genomic sequencing and culture-based analyses to date. This community includes a core microbiome, found universally among individuals, and a variable component influenced by environmental factors such as diet, lifestyle, and host genetics. Site-specific conditions, including oxygen gradients, pH levels, and nutrient availability, determine the spatial distribution of these microorganisms...
Tonsillitis I: Introduction01:30

Tonsillitis I: Introduction

Tonsillitis is inflammation of the tonsils, which are two lymphoid tissue masses at the back of the throat. This condition can cause discomfort and irritation in the throat.
Etiology
Three primary contributing factors have been identified.

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Related Experiment Video

Updated: Jun 19, 2026

Isolation of Tonsillar Mononuclear Cells to Study Ex Vivo Innate Immune Responses in a Human Mucosal Lymphoid Tissue
07:38

Isolation of Tonsillar Mononuclear Cells to Study Ex Vivo Innate Immune Responses in a Human Mucosal Lymphoid Tissue

Published on: June 14, 2020

Oropharyngeal flora changes after tonsillectomy.

Emin Karaman1, Ozgun Enver, Yalcin Alimoglu

  • 1Otolaryngology Department, Cerrahpasa Medical Faculty, Istanbul University, Istanbul, Turkey.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|October 29, 2009
PubMed
Summary

Tonsillectomy in children with chronic recurrent tonsillitis significantly alters oropharyngeal anaerobic bacteria, reducing harmful species like Bacteroides fragilis. This procedure may help restore a healthier bacterial balance in the oropharynx.

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Area of Science:

  • Microbiology
  • Otolaryngology
  • Pediatric Health

Background:

  • Chronic recurrent tonsillitis is a common condition in children.
  • The oropharyngeal flora plays a crucial role in maintaining local immunity.
  • Tonsils are known to harbor bacteria and may act as a reservoir for infection.

Purpose of the Study:

  • To investigate the impact of tonsillectomy on the oropharyngeal bacterial flora in children with chronic recurrent tonsillitis.
  • To compare preoperative and postoperative bacterial profiles.
  • To assess changes in both aerobic and anaerobic bacteria, as well as potentially pathogenic organisms.

Main Methods:

  • Prospective study involving 31 children undergoing tonsillectomy for chronic recurrent tonsillitis.
  • Collection of oropharyngeal swabs and tonsillar core biopsies.
  • Microbiologic evaluation of preoperative and one-month postoperative samples.

Main Results:

  • No significant change in the isolation rate of potentially pathogenic bacteria or normal aerobic flora.
  • A significant decrease in the isolation rate of anaerobic bacteria, specifically Bacteroides fragilis (P = 0.007).
  • A significant increase in the isolation rate of Propionibacterium acnes (P = 0.009).

Conclusions:

  • Tonsillectomy leads to a reduction in anaerobic bacteria in the oropharynx of children with recurrent tonsillitis.
  • The procedure does not significantly alter the rates of normal aerobic or potentially pathogenic bacteria.
  • Tonsillectomy may be beneficial in modulating the oropharyngeal anaerobic bacterial flora towards a healthier composition.