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Related Concept Videos

Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
Several diagnostic approaches are used to detect TB. The conventional method is the Tuberculin Skin Test (TST), also known as the Mantoux test. However, this method has...
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:
Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
Pulmonary Tuberculosis V01:28

Pulmonary Tuberculosis V

Medical management of tuberculosis (TB) patients involves a comprehensive approach that includes diagnosis, treatment, and monitoring. The specific strategies can vary depending on the type of tuberculosis (latent or active), the patient's overall health status, and other considerations.
Latent tuberculosis infection occurs when TB bacteria are present in a person's body, but are not causing illness or symptoms. It is not contagious, and preventive treatment is crucial to avoid the progression...
Tuberculosis01:23

Tuberculosis

Tuberculosis (TB) remains a significant global health concern, primarily targeting the lungs and spreading through airborne transmission. Infection begins when aerosolized droplet nuclei, expelled by an individual with active TB, are inhaled by another person. These microscopic particles carry Mycobacterium tuberculosis, the causative agent of TB. Upon reaching the alveoli, the bacilli are engulfed by alveolar macrophages. However, due to their specialized lipid-rich cell wall, these pathogens...

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Related Experiment Video

Updated: Jun 20, 2026

Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test
08:10

Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test

Published on: April 9, 2012

[New diagnostic test for tuberculosis].

Pernille Ravn1, Michala Vaaben Rose, Bolette Søborg

  • 1Infektionsmedicinsk Enhed, Medicinsk Afdeling O 107, Herlev Hospital, DK-2730 Herlev. pravn@dadlnet.dk

Ugeskrift for Laeger
|September 18, 2009
PubMed
Summary

Two Interferon Gamma Release Assays (IGRAs) show high specificity for detecting tuberculosis infection. While sensitivity is moderate, these tests are valuable for screening latent tuberculosis in specific populations.

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23:06

The MODS method for diagnosis of tuberculosis and multidrug resistant tuberculosis

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Mycobacteriology

Background:

  • Interferon Gamma Release Assays (IGRAs) detect Mycobacterium tuberculosis infection.
  • QuantiFERON-TB-Gold and T-SPOT-TB are commercially available IGRAs.
  • IGRAs detect T-cell recognition of M. tuberculosis-specific antigens, absent in BCG and most environmental mycobacteria.

Purpose of the Study:

  • To review the performance of QuantiFERON-TB-Gold and T-SPOT-TB.
  • To evaluate the utility of IGRAs in diagnosing active tuberculosis and screening latent infection.

Main Methods:

  • Review of performance data for QuantiFERON-TB-Gold and T-SPOT-TB.
  • Analysis of sensitivity and specificity for active tuberculosis detection.
  • Assessment of IGRA utility in BCG-vaccinated individuals and immunosuppressed patients.

Main Results:

  • IGRAs demonstrate high specificity (92-97%) for M. tuberculosis infection.
  • Sensitivity for active tuberculosis detection ranges from 76-88%, which is not optimal.
  • IGRAs show potential for screening latent tuberculosis infection.

Conclusions:

  • IGRAs are highly specific diagnostic tools for tuberculosis infection.
  • Their moderate sensitivity limits use as a standalone test for active tuberculosis.
  • IGRAs are valuable for latent tuberculosis screening in BCG-vaccinated and immunosuppressed individuals.