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Related Concept Videos

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 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.
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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...
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.
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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...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
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A 3D Human Lung Tissue Model for Functional Studies on Mycobacterium tuberculosis Infection
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Polyfunctional T cells in human tuberculosis.

Katalin A Wilkinson1, Robert J Wilkinson

  • 1MRC National Institute for Medical Research, Mill Hill, London, UK. r.j.wilkinson@imperial.ac.uk

European Journal of Immunology
|September 21, 2010
PubMed
Summary
This summary is machine-generated.

Polyfunctional T cells, secreting multiple cytokines, are thought to be key to protective immunity in chronic infections. However, their role in tuberculosis (TB) immunity remains debated, requiring further longitudinal studies.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • T cell biology

Background:

  • Antigen-specific T cells in chronic viral infections exhibit heterogeneity.
  • Polyfunctional T cells, secreting multiple cytokines and proliferating upon antigen encounter, are associated with protective immunity.
  • This concept has been extended to chronic bacterial infections like tuberculosis (TB).

Purpose of the Study:

  • To evaluate the role of polyfunctional T cells in mediating protection against tuberculosis (TB).
  • To address conflicting findings regarding polyfunctional T cell responses in human TB immunity.

Main Methods:

  • Analysis of T cell responses in human subjects with TB.
  • Assessment of polyfunctional T cell activity, including cytokine secretion and proliferation.
  • Comparison of findings with existing literature on viral and bacterial infections.

Main Results:

  • Some studies suggest polyfunctional T cells are involved in protective immunity in TB.
  • Emerging studies present conflicting data, questioning this association.
  • The heterogeneity of findings highlights challenges in studying human immunity to TB.

Conclusions:

  • The precise role of polyfunctional T cells in TB immunity requires further investigation.
  • Longitudinal studies are crucial for a better understanding, rather than case-control analyses.
  • Clarifying the function of these T cells is essential for developing effective TB vaccines and therapies.