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Related Concept Videos

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...
Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture01:26

Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture

Sputum studies are a critical part of diagnosing and treating numerous respiratory conditions. These studies involve obtaining sputum samples for analysis to identify pathogenic organisms and assess the presence of abnormal cells indicative of malignant conditions. This lesson will delve into three fundamental sputum studies: Gram Stain, Cytology, and Acid-fast Smear and Culture.
Gram Stain
The Gram Stain is an integral part of sputum studies. It involves the staining of sputum, which permits...
Sputum Studies II: Culture and Sensitivity01:20

Sputum Studies II: Culture and Sensitivity

Description
Sputum culture and sensitivity is a medical procedure used to diagnose bacterial infections in the respiratory tract and select the most appropriate antibiotics for treatment. This process involves analyzing sputum samples of thick and opaque secretions produced in the lungs and airways. These samples are collected from patients and then sent to the laboratory for analysis.
The test can identify various pathogens responsible for respiratory infections, including Streptococcus,...
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies01:27

Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies

Assessing and diagnosing Chronic Obstructive Pulmonary Disease (COPD) involves a detailed approach that includes a comprehensive review of medical history, physical examination, and a variety of diagnostic tests. This thorough evaluation is essential to ensure an accurate diagnosis and guide effective management strategies.
Medical History
Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
The first classification is based on the development of the disease, and it includes the following categories:

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Related Experiment Video

Updated: Jul 15, 2026

P. aeruginosa Infected 3D Co-Culture of Bronchial Epithelial Cells and Macrophages at Air-Liquid Interface for Preclinical Evaluation of Anti-Infectives
10:26

P. aeruginosa Infected 3D Co-Culture of Bronchial Epithelial Cells and Macrophages at Air-Liquid Interface for Preclinical Evaluation of Anti-Infectives

Published on: June 15, 2020

Microbiologic follow-up study in adult bronchiectasis.

Paul T King1, Stephen R Holdsworth, Nicholas J Freezer

  • 1Department of Respiratory and Sleep Medicine, Monash Medical Centre, Clayton, Melbourne 3168, Australia. paul.king@med.monash.edu.au

Respiratory Medicine
|May 1, 2007
PubMed
Summary

This study tracked lung bacteria in bronchiectasis patients for nearly 6 years. It found common pathogens like Haemophilus influenzae persist, with increasing antibiotic resistance and distinct disease severity linked to specific microbes.

More Related Videos

Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice
15:43

Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice

Published on: March 17, 2014

Related Experiment Videos

Last Updated: Jul 15, 2026

P. aeruginosa Infected 3D Co-Culture of Bronchial Epithelial Cells and Macrophages at Air-Liquid Interface for Preclinical Evaluation of Anti-Infectives
10:26

P. aeruginosa Infected 3D Co-Culture of Bronchial Epithelial Cells and Macrophages at Air-Liquid Interface for Preclinical Evaluation of Anti-Infectives

Published on: June 15, 2020

Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice
15:43

Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice

Published on: March 17, 2014

Area of Science:

  • Pulmonary Medicine
  • Microbiology
  • Clinical Research

Background:

  • Longitudinal data on pathogenic microorganisms in adult bronchiectasis is scarce.
  • Understanding microbial dynamics is crucial for managing this chronic respiratory condition.

Purpose of the Study:

  • To prospectively assess the longitudinal microbiologic profile in adults with bronchiectasis.
  • To correlate microbial findings with clinical outcomes and disease severity over time.

Main Methods:

  • Prospective observational study involving 89 adult bronchiectasis patients.
  • Regular clinical assessments by a respiratory physician and sputum sample collection for microbial analysis.
  • Follow-up duration averaged 5.7 years with repeat assessments.

Main Results:

  • Haemophilus influenzae (40-47%) and Pseudomonas aeruginosa (12-18%) were the most common pathogens.
  • Prevalence of antibiotic resistance in isolates increased from 13% to 30% over the study period.
  • Nontypeable H. influenzae strains were prevalent and genetically diverse.
  • Absence of pathogens correlated with milder disease, while P. aeruginosa presence indicated more severe bronchiectasis.

Conclusions:

  • Adults with bronchiectasis often maintain colonization with the same bacterium over extended periods (average 5 years).
  • Specific pathogens are associated with distinct clinical disease patterns and severity.
  • Increasing antibiotic resistance is a significant concern in this patient population.