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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 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 II01:28

Pulmonary Tuberculosis II

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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 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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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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Other Pulmonary Disorders01:17

Other Pulmonary Disorders

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Respiratory disorders encompass a range of conditions with varying levels of severity. Asthma, marked by chronic airway inflammation and hypersensitivity, is one such condition. It can lead to airway obstruction due to factors like bronchial spasms, mucosal edema, increased mucus secretion, or epithelial damage. Asthma triggers are diverse, ranging from allergens to emotional upset, and treatment focuses on both immediate relief through bronchodilators and long-term inflammation suppression.
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Related Experiment Video

Updated: Apr 16, 2026

Methods to Evaluate Cytotoxicity and Immunosuppression of Combustible Tobacco Product Preparations
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Methods to Evaluate Cytotoxicity and Immunosuppression of Combustible Tobacco Product Preparations

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[Association between smoking and tuberculosis infection].

Hitoshi Tagawa, Hironobu Sugita, Tomoaki Nakazono

    Kekkaku : [Tuberculosis]
    |March 4, 2015
    PubMed
    Summary

    Smoking significantly increases the risk of tuberculosis (TB) infection among individuals exposed to TB. This study highlights smoking as an independent risk factor for latent TB infection, as detected by Interferon-Gamma Release Assays (IGRA).

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    Area of Science:

    • Public Health Research
    • Infectious Disease Epidemiology
    • Respiratory Medicine

    Context:

    • Tuberculosis (TB) remains a global health concern, with smoking identified as a potential risk factor in various populations.
    • Previous studies on smoking and TB primarily utilized the tuberculin test for diagnosis.
    • The utility of Interferon-Gamma Release Assays (IGRA) in assessing smoking as a risk factor for TB infection among close contacts has not been extensively reported.

    Purpose:

    • To evaluate smoking as a risk factor for TB infection in individuals with TB exposure using the IGRA test.
    • To compare the prevalence of IGRA positivity between smokers and non-smokers who have had contact with TB patients.

    Summary:

    • A retrospective study analyzed 390 TB contacts, comparing IGRA results between smokers and non-smokers.
    • The study found a significantly higher rate of IGRA positivity (4.9%) among TB contacts.
    • Smoking (current or past) was identified as an independent risk factor for IGRA positivity (OR 3.06, p=0.027), indicating latent TB infection.

    Impact:

    • This research underscores the importance of considering smoking status when assessing TB infection risk in close contacts.
    • Findings suggest that smokers exposed to TB may be at a higher risk of developing latent or active disease.
    • The study advocates for integrating smoking cessation interventions into TB control strategies, particularly for high-risk populations.