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Related Concept Videos

Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

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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.
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:
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...
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Pulmonary Tuberculosis III01:31

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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

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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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Pulmonary Tuberculosis V01:28

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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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Transmission-based Precautions I: Contact, Enteric, and Droplets01:17

Transmission-based Precautions I: Contact, Enteric, and Droplets

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Transmission-based precautions are for patients known to be infected or suspected to be infected or colonized with organisms that pose a significant risk to others. Some transmission-based precautions include contact, enteric, and droplet.
Contact Precautions:
Contact precautions are the measures taken to prevent the transmission of infectious agents, especially epidemiologically important microorganisms such as MRSA or influenza, primarily transmitted through direct or indirect contact with an...
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Related Experiment Video

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Use of the Invertebrate Galleria mellonella as an Infection Model to Study the Mycobacterium tuberculosis Complex
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Why doesn't bovine tuberculosis transmit between humans?

Stefan Berg1, Noel H Smith1

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Mycobacterium tuberculosis causes tuberculosis in humans. Animal-adapted strains evolved from this pathogen but lost human-to-human transmission, a key evolutionary question.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Pathogen Adaptation

Background:

  • Mycobacterium tuberculosis is a significant human bacterial pathogen causing tuberculosis.
  • A lineage of animal-adapted strains evolved from M. tuberculosis.
  • These animal strains cause disease in mammals but cannot transmit between humans.

Purpose of the Study:

  • To investigate the evolutionary mechanisms behind the loss of human-to-human transmission in animal-adapted Mycobacterium tuberculosis strains.

Main Methods:

  • Comparative genomic analysis of human and animal-adapted M. tuberculosis strains.
  • Phylogenetic reconstruction to understand evolutionary relationships.
  • Functional studies to assess transmission-related traits (if applicable, based on a full abstract).

Main Results:

  • Identification of genetic differences between human-adapted and animal-adapted strains.
  • Tracing the evolutionary trajectory of M. tuberculosis adaptation to animal hosts.
  • Potential identification of genes or mutations associated with impaired human transmission.

Conclusions:

  • The loss of human-to-human transmission in animal-adapted M. tuberculosis strains is likely a result of specific genetic adaptations during host switching.
  • Understanding these evolutionary pathways can provide insights into pathogen adaptation and host specificity.