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[Comparative study and sensitivity tests of Mycobacterium tuberculosis strains using nitrate reductase and absolute
Daniela Homorodean1, Andreea Melinda Jodal, Mihaela Stoian
1Spitalul Clinic de Pneumoftiziologie Cluj Napoca.
Bacteriologia, Virusologia, Parazitologia, Epidemiologia (Bucharest, Romania : 1990)
|May 11, 2011
Summary
The nitrate reductase method offers a rapid, cost-effective, and highly accurate approach for testing tuberculosis drug resistance. This method demonstrates 100% sensitivity and specificity, making it ideal for widespread laboratory use.
Area of Science:
- Microbiology
- Infectious Diseases
- Clinical Diagnostics
Background:
- Rising cases of drug-resistant tuberculosis necessitate rapid and affordable diagnostic methods.
- Current large-scale testing of mycobacterial strains for drug resistance is challenging.
Purpose of the Study:
- To evaluate the performance of two phenotypic methods for mycobacterial drug sensitivity testing: nitrate reductase and absolute concentration.
- To assess the sensitivity, specificity, and reproducibility of the nitrate reductase method compared to the absolute concentration method.
Main Methods:
- Two laboratories tested 30 mycobacterial strains (20 international panel, 10 local isolates) using both nitrate reductase and absolute concentration methods.
- Lowenstein Jensen medium incorporating rifampicin and isoniazid was used for both phenotypic methods.
- The absolute concentration method served as the standard for comparison.
Main Results:
- Results from both laboratories were concordant for both tested methods.
- The nitrate reductase method demonstrated 100% sensitivity and 100% specificity when compared to the absolute concentration method.
- Both methods exhibited 100% reproducibility across the two laboratories.
Conclusions:
- The nitrate reductase method is simple to perform, requires no specialized equipment, and yields highly accurate results.
- With 100% sensitivity, specificity, and reproducibility, the nitrate reductase method is suitable for national mycobacteriology networks to screen for multidrug-resistant strains.