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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 II01:28

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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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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

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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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Pulmonary Tuberculosis III01:31

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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.
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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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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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[Frequency Distribution and Risk Factors for Latent Tuberculosis in Contact Persons: Cologne 2012-2016].

L V Dwenger1,2, N Funke1, P Stephany1

  • 1Gesundheitsamt der Stadt Köln, Abteilung Infektions- und Umwelthygiene, Tuberkulose-Beratungsstelle.

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Latent tuberculosis (LTBI) was diagnosed in 12.5% of tuberculosis patient contacts in Cologne. Male sex, age over 50, and household exposure were identified as risk factors for LTBI.

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Area of Science:

  • Public Health
  • Infectious Diseases
  • Epidemiology

Background:

  • Tuberculosis (TB) control strategies, including the WHO end-TB strategy, emphasize examining contacts of TB patients for latent tuberculosis infection (LTBI).
  • LTBI activation significantly contributes to new TB cases in low-incidence countries like Germany.
  • Systematic data on LTBI rates among contacts in Germany is lacking, necessitating local studies to inform public health interventions.

Purpose of the Study:

  • To determine the rate of LTBI diagnoses among contacts of active pulmonary TB cases in Cologne, Germany.
  • To identify risk factors associated with LTBI in this contact group.
  • To re-evaluate standard inclusion criteria for TB contact investigations in routine German practice.

Main Methods:

  • A retrospective cohort study analyzed data from 07/2012 to 12/2016, including 2834 contact persons meeting inclusion criteria.
  • Latent tuberculosis infection (LTBI) was diagnosed using a positive interferon-gamma release assay (IGRA) without signs of active TB.
  • Statistical analysis involved descriptive frequencies and univariate/multivariate logistic regression to identify risk factors (p ≤ 0.05).

Main Results:

  • The study found an LTBI positivity rate of 12.5% among 2834 evaluated contact persons.
  • Higher LTBI risk was associated with male sex (OR=1.95), age ≥ 50 years (OR=1.8), and household exposure (OR=2.37).
  • Contact persons of smear-negative but culture-positive index patients showed a significantly higher positivity rate (14.3%, p=0.033).

Conclusions:

  • The LTBI positivity rate of 12.5% in Cologne contacts is lower than in some international studies, using German standard criteria.
  • Identified risk factors for LTBI (male sex, older age, household exposure) align with known patterns.
  • The increased LTBI risk in contacts of smear-negative, culture-positive patients highlights the importance of thorough contact tracing in this subgroup.