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Related Concept Videos

Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

1.0K
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...
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Pulmonary Tuberculosis II01:28

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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:
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Pulmonary Tuberculosis V01:28

Pulmonary Tuberculosis V

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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...
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Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

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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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Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

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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...
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Inflammation01:38

Inflammation

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Overview
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Related Experiment Video

Updated: Feb 14, 2026

Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test
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Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test

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Platelets Regulate Pulmonary Inflammation and Tissue Destruction in Tuberculosis.

Katharine A Fox1, Daniela E Kirwan1, Ashley M Whittington1

  • 11 Infectious Diseases and Immunity, Wellcome Trust Centre for Global Health Research, and.

American Journal of Respiratory and Critical Care Medicine
|February 9, 2018
PubMed
Summary

Platelets promote inflammation and tissue damage in tuberculosis (TB) by activating monocytes. This interaction impairs the immune system's ability to fight Mycobacterium tuberculosis (M.tb) infection.

Keywords:
humaninnate immunitymatrix metalloproteinasesplateletstuberculosis

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Hematology

Background:

  • Tuberculosis (TB) involves complex host-pathogen interactions.
  • Platelets are increasingly recognized for their role beyond hemostasis, including immune modulation.
  • Understanding platelet involvement in TB pathogenesis is crucial for developing new therapeutic strategies.

Purpose of the Study:

  • To elucidate the functional role of platelets in the innate inflammatory and matrix-degrading responses during tuberculosis.
  • To investigate how platelets influence monocyte behavior and Mycobacterium tuberculosis (M.tb) infection.

Main Methods:

  • Examined platelet activation markers in TB patients and controls.
  • Studied platelet-monocyte interactions in M.tb-infected cocultures using molecular and functional assays.
  • Assessed platelet presence and mediator levels in a murine TB model and human bronchoalveolar lavage (BAL) fluid.

Main Results:

  • Platelet mediators were upregulated in TB patients, decreasing with treatment.
  • Platelets enhanced monocyte production of MMP-1 and MMP-10, leading to collagen degradation.
  • Platelets promoted an M2 monocyte phenotype, reducing intracellular M.tb killing.

Conclusions:

  • Platelets contribute to a pro-inflammatory and tissue-degrading environment in TB.
  • Platelet-monocyte interactions exacerbate TB pathology by impairing bacterial clearance and promoting tissue damage.