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[Detection of Mycobacterium tuberculosis complex with polymerase chain reaction (PCR)]
U Schröder1, C Schindler, S Rüsch-Gerdes
1Forschungsinstitut Borstel.
Pneumologie (Stuttgart, Germany)
|September 1, 1995
Summary
This study found Nested-PCR to be a highly sensitive and specific method for detecting Mycobacterium tuberculosis. While conventional methods missed some cases, modified PCR improved detection rates, especially in patients undergoing treatment.
Area of Science:
- Microbiology
- Molecular Biology
- Infectious Diseases
Background:
- Tuberculosis diagnosis relies on conventional culture methods, which can be time-consuming.
- Molecular methods like PCR offer potential for faster and more sensitive detection of Mycobacterium tuberculosis.
Purpose of the Study:
- To evaluate the sensitivity and specificity of a Nested-PCR assay for detecting Mycobacterium tuberculosis in respiratory specimens.
- To compare Nested-PCR performance against conventional culture methods.
Main Methods:
- Nested-PCR was performed on 248 respiratory specimens.
- Results were compared with conventional solid and liquid media culture.
Main Results:
- 54 specimens were culture-positive for M. tuberculosis.
- Nested-PCR detected 51 of these, missing 3.
- 15 specimens were positive by PCR only, with 12 from patients under treatment.
- Modified PCR detected the 3 initially PCR-negative specimens.
- The overall positive rate was 21.8%.
Conclusions:
- Nested-PCR is a highly specific and sensitive method for M. tuberculosis detection.
- Modified Nested-PCR enhances detection capabilities, particularly in treated patients.
- Further investigation into non-pulmonary specimens may be warranted.