Related Experiment Videos
IGRAs--the gateway to T cell based TB diagnosis
Hilary S Whitworth1, Melanie Scott, David W Connell
1Tuberculosis Research Unit, Respiratory Infection Section, National Heart and Lung Institute, Imperial College London, London W2 1PG, UK.
Methods (San Diego, Calif.)
|January 9, 2013
Summary
Interferon-Gamma Release Assays (IGRAs) have transformed latent tuberculosis (TB) diagnosis, offering higher accuracy than the tuberculin skin test (TST). New advancements promise to overcome current IGRA limitations for improved TB infection detection.
Area of Science:
- Immunology
- Infectious Diseases
- Diagnostic Medicine
Background:
- Interferon-Gamma Release Assays (IGRAs) revolutionized latent tuberculosis (TB) infection (LTBI) diagnosis.
- IGRAs, such as TSPOT.TB and QuantiFERON Gold In-Tube, offer superior specificity and sensitivity compared to the traditional tuberculin skin test (TST).
Purpose of the Study:
- To review the impact and limitations of current Interferon-Gamma Release Assays (IGRAs) in diagnosing latent tuberculosis infection (LTBI).
- To highlight emerging diagnostic technologies that address existing IGRA limitations.
Main Methods:
- Comparison of TSPOT.TB (ELISpot) and QuantiFERON Gold In-Tube (ELISA) assays for detecting TB-specific T cell responses.
- Quantification of interferon-gamma (IFNγ) released from T cells stimulated with TB antigens.
Main Results:
- IGRAs enable detection of TB infection by measuring IFNγ release from stimulated T cells.
- Established IGRA platforms provide a foundation for implementing T cell-based diagnostics in routine clinical practice.
Conclusions:
- IGRAs represent a significant advancement over TST for LTBI diagnosis, despite some limitations.
- Ongoing research into novel antigens and methodologies is paving the way for next-generation diagnostic tests for TB infection.
Related Concept Videos
01:26Pulmonary 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...
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...
01:24Automated Microbial Diagnostics
Automated diagnostic analyzers have transformed clinical microbiology by providing rapid and reliable methods for pathogen identification and antibiotic susceptibility testing. Among these systems, the Vitek 2 is widely used because it automates the traditionally labor-intensive processes of microbial identification (ID) and antibiotic susceptibility testing (AST), delivering standardized and timely results that are essential for effective patient care.Microbial Identification with ID CardsThe...