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Related Concept Videos

Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

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...
Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

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:
Pulmonary Tuberculosis V01:28

Pulmonary Tuberculosis V

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 progression...
Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

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...
Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

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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Antigen-based skin tests in community-wide active case finding for TB.

M Ahson1, S Kern-Allely2, N Mintz3

  • 1Epidemic Intelligence Service, CDC, Atlanta, GA, USA;, Division of Global HIV and Tuberculosis, U.S. CDC, Atlanta, GA, USA;, U.S. Public Health Service, Washington, DC, USA.

The International Journal of Tuberculosis and Lung Disease : the Official Journal of the International Union Against Tuberculosis and Lung Disease
|June 2, 2026
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Mycobacterium tuberculosis antigen-based skin tests (TBSTs) are feasible and safe for diagnosing TB infection (TBI) in remote, high-incidence communities. Lower positivity rates compared to tuberculin skin tests (TSTs) suggest improved specificity in BCG-vaccinated populations.

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Area of Science:

  • Infectious Diseases
  • Public Health
  • Diagnostic Testing

Background:

  • Mycobacterium tuberculosis antigen-based skin tests (TBSTs) were recommended globally in 2022 for diagnosing TB infection (TBI).
  • TBSTs offer higher specificity than tuberculin skin tests (TSTs), especially in Bacillus Calmette-Guérin (BCG)-vaccinated individuals.
  • This study reports on the implementation of TBSTs in community-wide active case finding (ACF) within remote, high-incidence settings.

Purpose of the Study:

  • To evaluate the feasibility and safety of TBSTs for community-wide active case finding (ACF) in remote, high-incidence areas.
  • To compare TBST positivity rates with historical TST data in a BCG-vaccinated population.
  • To assess the diagnostic yield of TBSTs in identifying TB infection and disease.

Main Methods:

  • TBSTs were deployed during community-wide ACF in the Mortlock and Northwest Islands, Federated States of Micronesia, from May to June 2024.
  • Screening involved home interviews, TBST administration, and follow-up at mobile clinics, with chest radiography and sputum collection for suspected TB disease.
  • Programmatic data were analyzed to compare TBST positivity with a propensity-matched TST-tested population from 2023.

Main Results:

  • 1,354 participants underwent ACF screening, with 186 (13.7%) testing positive via TBST.
  • Of those with positive TBST results, 163 were diagnosed with TBI and 23 with TB disease.
  • TBST positivity was 0.65 times that of the matched TST-tested population, with no reported adverse events.

Conclusions:

  • TBST implementation was feasible and safe for community-wide ACF in remote settings.
  • The lower TBST positivity rate, compared to TST, suggests improved specificity and fewer false positives in this BCG-vaccinated population.
  • TBSTs represent a valuable tool for diagnosing TB infection and disease in remote, high-incidence, BCG-vaccinated communities.