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Related Concept Videos

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.
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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.
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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.
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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.
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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.
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Concomitant immunity to M. tuberculosis infection.

Louis R Joslyn1,2, JoAnne L Flynn3, Denise E Kirschner4

  • 1Department of Chemical Engineering, University of Michigan, G045W NCRC B28, 2800 Plymouth Rd, Ann Arbor, MI, 48109-2136, USA.

Scientific Reports
|December 1, 2022
PubMed
Summary
This summary is machine-generated.

Concomitant immunity protects against reinfection by Mycobacterium tuberculosis (Mtb). This study suggests tissue resident memory T cells (Trms) are key to this protection, estimating their lifespan in human lungs at 2-3 years.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Computational Biology

Background:

  • Persistent infections can induce concomitant immunity, offering protection against reinfection.
  • Mycobacterium tuberculosis (Mtb) infection presents a complex immune challenge, with the potential for reinfection.
  • Understanding the mechanisms of protective immunity against Mtb is crucial for developing effective vaccines and treatments.

Purpose of the Study:

  • To investigate the phenomenon of concomitant immunity during Mycobacterium tuberculosis infection.
  • To determine the role of tissue resident memory T cells (Trms) and circulating T cells in Mtb-specific immunity.
  • To estimate the lifespan of resident memory T cells in human lung tissue.

Main Methods:

  • Utilized HostSim, a virtual host model of the immune response to Mtb infection.
  • Simulated Mtb reinfection scenarios within the HostSim model.
  • Compared simulation data with non-human primate studies and pre-antibiotic era human tuberculosis (TB) observational data.

Main Results:

  • Proposed a hypothesis that concomitant immunity against Mtb durability is linked to primary infection Trm levels, with a secondary role for circulating T cells.
  • Estimated the upper bound lifespan of resident memory T cells in human lung tissue to be 2-3 years.
  • This marks the first known estimate of resident memory T-cell lifespan in humans.

Conclusions:

  • Tissue resident memory T cells (Trms) play a critical role in preventing Mtb disease.
  • The lifespan of lung Trms is estimated to be 2-3 years.
  • Inducing lung Trms is likely essential for successful Mtb vaccine development.