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Related Concept Videos

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 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...
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...
Tuberculosis01:23

Tuberculosis

Tuberculosis (TB) remains a significant global health concern, primarily targeting the lungs and spreading through airborne transmission. Infection begins when aerosolized droplet nuclei, expelled by an individual with active TB, are inhaled by another person. These microscopic particles carry Mycobacterium tuberculosis, the causative agent of TB. Upon reaching the alveoli, the bacilli are engulfed by alveolar macrophages. However, due to their specialized lipid-rich cell wall, these pathogens...
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
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Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...

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Updated: Jun 28, 2026

Demonstrating a Multi-drug Resistant Mycobacterium tuberculosis Amplification Microarray
07:35

Demonstrating a Multi-drug Resistant Mycobacterium tuberculosis Amplification Microarray

Published on: April 25, 2014

Extensively drug-resistant tuberculosis.

Mandeep Jassal1, William R Bishai

  • 1Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD 21231-1044, USA.

The Lancet. Infectious Diseases
|November 8, 2008
PubMed
Summary

Extensively drug-resistant tuberculosis (XDR-TB) is a growing global threat, characterized by resistance to multiple drugs. Effective control requires innovative, comprehensive strategies addressing political, social, economic, and scientific factors.

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Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test
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Last Updated: Jun 28, 2026

Demonstrating a Multi-drug Resistant Mycobacterium tuberculosis Amplification Microarray
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Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test
08:10

Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test

Published on: April 9, 2012

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Public Health

Background:

  • Extensively drug-resistant tuberculosis (XDR-TB) is defined by resistance to key anti-TB drugs, including isoniazid, rifampicin, fluoroquinolones, and specific injectables.
  • Global surveillance indicates a concerning rise in tuberculosis drug resistance, reaching unprecedented levels.
  • Current diagnostic methods, like the agar proportion method, are time-consuming, and advanced tests are lacking in resource-limited settings.

Purpose of the Study:

  • To define extensively drug-resistant tuberculosis (XDR-TB).
  • To highlight the clinical implications and challenges in managing XDR-TB.
  • To emphasize the need for comprehensive strategies to control drug-resistant tuberculosis.

Main Methods:

  • Definition of XDR-TB based on drug resistance patterns.
  • Review of surveillance data on tuberculosis drug resistance prevalence.
  • Analysis of clinical manifestations, morbidity, and mortality associated with XDR-TB.
  • Evaluation of current treatment limitations and healthcare system weaknesses in endemic countries.

Main Results:

  • XDR-TB is associated with significantly higher morbidity and mortality compared to non-XDR strains.
  • Treatment of XDR-TB requires prolonged therapy (18-24 months) with susceptible agents but faces limitations in endemic regions.
  • Weaknesses in national tuberculosis healthcare models hinder effective XDR-TB management.

Conclusions:

  • Controlling drug-resistant tuberculosis necessitates a multifaceted approach.
  • Innovation across political, social, economic, and scientific domains is crucial for combating XDR-TB.
  • Strengthening national tuberculosis programs is essential for improved patient outcomes and disease control.