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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
Steps in Outbreak Investigation01:18

Steps in Outbreak Investigation

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In the ever-evolving field of public health, statistical analysis serves as a cornerstone for understanding and managing disease outbreaks. By leveraging various statistical tools, health professionals can predict potential outbreaks, analyze ongoing situations, and devise effective responses to mitigate impact. For that to happen, there are a few possible stages of the analysis:
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Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

296
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 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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Causality in Epidemiology01:21

Causality in Epidemiology

618
Causality or causation is a fundamental concept in epidemiology, vital for understanding the relationships between various factors and health outcomes. Despite its importance, there's no single, universally accepted definition of causality within the discipline. Drawing from a systematic review, causality in epidemiology encompasses several definitions, including production, necessary and sufficient, sufficient-component, counterfactual, and probabilistic models. Each has its strengths and...
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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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Infectious and clinical tuberculosis trajectories: Bayesian modeling with case finding implications.

Theresa S Ryckman1, David W Dowdy1, Emily A Kendall2

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Proceedings of the National Academy of Sciences of the United States of America
|December 19, 2022
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Identifying individuals with undiagnosed tuberculosis (TB) is crucial for controlling transmission. Subclinical TB with high bacterial load disproportionately drives future TB spread, necessitating scalable screening assays.

Keywords:
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Area of Science:

  • Epidemiology
  • Mathematical Modeling
  • Infectious Disease Dynamics

Background:

  • Undiagnosed tuberculosis (TB) contributes significantly to ongoing transmission and morbidity.
  • Optimizing screening strategies requires understanding the future disease trajectories of individuals with TB.

Purpose of the Study:

  • To model the future disease trajectories of individuals with TB at a baseline timepoint.
  • To estimate the contribution of different baseline TB states to future transmission.

Main Methods:

  • Construction of a mathematical model tracking TB trajectories based on bacterial burden and symptom status.
  • Bayesian calibration of the model using historical survival, notification, mortality, and prevalence data from five countries.
  • Integration of disease trajectories with infectiousness data to quantify transmission contributions.

Main Results:

  • Subclinical TB with smear-positive status had a longer undiagnosed duration and accounted for a disproportionate share of future transmission (35-51%).
  • Smear-negative subclinical TB had a shorter disease duration with most cases resolving spontaneously.
  • Despite representing a smaller proportion of prevalent disease, smear-positive subclinical TB was a major driver of transmission.

Conclusions:

  • Subclinical tuberculosis with high bacterial burden significantly contributes to future TB transmission.
  • Development of inexpensive, scalable screening assays for both symptomatic and asymptomatic individuals is recommended, even if sensitivity is limited.