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Related Concept Videos

Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

297
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...
297
Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

305
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...
305
Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

188
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...
188
Pulmonary Tuberculosis V01:28

Pulmonary Tuberculosis V

225
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...
225
Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

412
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:
412
Microbial Growth Measurement: Indirect Methods01:27

Microbial Growth Measurement: Indirect Methods

121
Estimating microbial growth is essential for understanding population dynamics and environmental adaptations. Indirect methods provide valuable insights by measuring parameters such as turbidity, metabolic activity, and biomass, enabling efficient and reproducible assessments.During exponential growth, microbial cells scatter light proportionally to their biomass, a principle used in turbidity measurements. About one million cells per milliliter produce detectable scattering, which a...
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A Tuberculosis Molecular Bacterial Load Assay TB-MBLA
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Quantifying Mycobacterium tuberculosis Transmission Dynamics Across Global Settings: A Systematic Analysis.

Jonathan P Smith, Ted Cohen, David Dowdy

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    Individual differences in tuberculosis (TB) transmission, known as superspreading, significantly drive disease spread. A small fraction of cases are responsible for the majority of TB transmission, highlighting the need to address heterogeneity in control strategies.

    Keywords:
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    Area of Science:

    • Epidemiology
    • Genomics
    • Infectious Disease Dynamics

    Background:

    • Tuberculosis (TB) transmission dynamics are influenced by individual heterogeneity, termed superspreading.
    • The impact of superspreading on TB transmission has not been systematically quantified.
    • Whole genome sequencing (WGS) provides powerful tools for inferring transmission patterns.

    Purpose of the Study:

    • To systematically investigate the role of individual heterogeneity in TB transmission.
    • To estimate transmission parameters, including the reproduction number (R) and dispersion parameter (k), across diverse settings.
    • To quantify the proportion of TB cases driving transmission.

    Main Methods:

    • Systematic literature search for population-based or surveillance studies using WGS for TB transmission analysis.
    • Enumeration of putative TB transmission cluster size distributions.
    • Fitting cluster-size data to a negative binomial branching process model to infer R and k.
    • Analysis of 9 eligible studies from 8 global settings, including studies on drug-susceptible and drug-resistant TB.

    Main Results:

    • Estimated reproduction numbers (R) ranged from 0.10 to 0.73, indicating declining TB epidemics in the studied settings.
    • Estimated dispersion parameters (k) were consistently low (0.02–0.48), signifying substantial individual-level heterogeneity in transmission.
    • A small proportion of TB cases (2%–31%) were estimated to be responsible for 80% of ongoing transmission.

    Conclusions:

    • Substantial individual heterogeneity in TB transmission is a consistent feature across diverse global settings.
    • A minority of infectious individuals drive a disproportionately large share of TB transmission.
    • Targeting sources of transmission heterogeneity is crucial for effective TB control and mitigation efforts.