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Related Concept Videos

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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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.
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Sputum studies are a critical part of diagnosing and treating numerous respiratory conditions. These studies involve obtaining sputum samples for analysis to identify pathogenic organisms and assess the presence of abnormal cells indicative of malignant conditions. This lesson will delve into three fundamental sputum studies: Gram Stain, Cytology, and Acid-fast Smear and Culture.
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Description
Sputum culture and sensitivity is a medical procedure used to diagnose bacterial infections in the respiratory tract and select the most appropriate antibiotics for treatment. This process involves analyzing sputum samples of thick and opaque secretions produced in the lungs and airways. These samples are collected from patients and then sent to the laboratory for analysis.
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Pulmonary Tuberculosis I01:29

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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.
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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.
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Pooling Sputum Samples for Efficient Mass Tuberculosis Screening in Prisons.

Paulo César Pereira Dos Santos1, Andrea da Silva Santos1, Roberto Dias de Oliveira2

  • 1Faculty of Health Sciences, Federal University of Grande Dourados, Dourados, Mato Grosso do Sul, Brazil.

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
|October 31, 2021
PubMed
Summary

Tuberculosis screening in prisons using Xpert Ultra sputum pooling is a sensitive and cost-effective strategy. This method improves active case finding efficiency across various prevalence settings, making it a valuable tool for public health initiatives.

Keywords:
mass screeningprisonsputum poolingtuberculosis

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Area of Science:

  • Infectious Diseases
  • Public Health
  • Molecular Diagnostics

Background:

  • World Health Organization (WHO) recommends systematic tuberculosis (TB) screening in high-risk groups.
  • Resource constraints limit TB screening implementation in correctional facilities.
  • The efficacy of Xpert Ultra sputum pooling for mass TB screening in prisons remains unevaluated.

Purpose of the Study:

  • To assess the sensitivity and efficiency of Xpert Ultra sputum pooling for tuberculosis screening in a prison setting.
  • To determine the optimal sputum pool size for TB detection at varying prevalence rates.
  • To evaluate the cost-effectiveness of sputum pooling compared to individual testing.

Main Methods:

  • Collected 1280 sputum samples from incarcerated individuals in Brazil.
  • Tested samples using Xpert G4 and then created pools of 4, 8, 12, and 16 samples for Xpert Ultra testing.
  • Simulated TB screening at prevalences of 0.5-5% and calculated cost per case detected.

Main Results:

  • Sputum pooling demonstrated high sensitivity (94%) and specificity (100%) for TB detection.
  • Sensitivity was higher when the positive sample had a high mycobacterial load (100%) versus very low (88%).
  • Pools of 4 and 8 were more efficient at higher TB prevalences, while larger pools reduced costs by 87% at low prevalences.

Conclusions:

  • Xpert Ultra sputum pooling is a sensitive and efficient strategy for tuberculosis screening in prisons.
  • This approach is more cost-effective than individual testing across diverse prevalence scenarios.
  • Sputum pooling facilitates scalable active case finding while managing costs effectively.