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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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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.
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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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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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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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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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Related Experiment Video

Updated: Mar 28, 2026

Multi-locus Variable-number Tandem-repeat Analysis of the Fish-pathogenic Bacterium Yersinia ruckeri by Multiplex PCR and Capillary Electrophoresis
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Tuberculosis outbreak in Eastern Norway.

Trude Margrete Arnesen1, Siri Seterelv1, Gunnstein Norheim1

  • 1Divisjon for smittevern Nasjonalt folkehelseinstitutt.

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke
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Summary

A delayed diagnosis of tuberculosis in Norway led to a large outbreak among adolescents. This highlights the need for vigilance in diagnosing tuberculosis, even in low-incidence populations.

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Area of Science:

  • Epidemiology
  • Infectious Diseases
  • Public Health

Background:

  • Tuberculosis (TB) is uncommon in Norway, particularly among native-born individuals.
  • Contact tracing is crucial for controlling pulmonary TB transmission.
  • This study investigates a significant TB outbreak involving Norwegian adolescents.

Purpose of the Study:

  • To investigate a tuberculosis outbreak linked to an educational institution in Norway.
  • To analyze the contact tracing efforts and outcomes associated with the outbreak.
  • To emphasize the importance of TB as a differential diagnosis in Norway.

Main Methods:

  • Case identification through the Norwegian Surveillance System for Communicable Diseases (MSIS).
  • Genetic analysis of Mycobacterium tuberculosis strains to link cases.
  • Investigation of exposure and contact networks within the affected population.

Main Results:

  • A total of 22 TB cases were linked to the educational institution outbreak (2009-2013).
  • Initial case had prolonged symptoms, leading to extensive contact tracing (319 individuals).
  • Subsequent contact tracing for 21 cases involved 313 individuals, with varying results.

Conclusions:

  • Delayed diagnosis of the index case contributed to the large scale of this TB outbreak.
  • Contact tracing efforts were inconsistent and not clearly related to infectiousness.
  • The outbreak underscores the necessity of maintaining a high index of suspicion for TB, even in low-risk populations like native-born Norwegians.