Related Experiment Videos
Use of polymerase chain reaction for improved diagnosis of tuberculosis in children
C Delacourt1, J D Poveda, C Chureau
1Service de Pneumo-Pédiatrie, Hôpital des Enfants Malades, Paris, France.
Insights
Rapid polymerase chain reaction (PCR) testing effectively detects Mycobacterium tuberculosis in children. This DNA amplification method aids early diagnosis, especially when clinical signs of tuberculosis are unclear or require swift confirmation.
Area of Science:
- Pediatric Infectious Diseases
- Molecular Diagnostics
- Microbiology
Background:
- Tuberculosis (TB) diagnosis in children presents challenges due to non-specific symptoms.
- Early and accurate detection of Mycobacterium tuberculosis is crucial for effective treatment and public health.
Purpose of the Study:
- To evaluate the utility of a rapid diagnostic method using polymerase chain reaction (PCR) for detecting Mycobacterium tuberculosis in pediatric patients.
- To assess the value of IS6110 element DNA amplification for diagnosing childhood tuberculosis.
Main Methods:
- Polymerase chain reaction (PCR) was employed to amplify a fragment of the IS6110 insertion element.
- Specimens from 68 children suspected of having tuberculosis were analyzed.
- DNA extraction methods and sample types (e.g., bronchoalveolar lavage, gastric aspirates) were compared for diagnostic yield.
Main Results:
- PCR demonstrated high specificity (100%) in children without tuberculosis.
- Sensitivity was improved by testing multiple samples and using Chelex for DNA extraction.
- Positive PCR results were observed in 83.3% of children with active disease and 38.9% with tuberculous infection.
Conclusions:
- DNA amplification via PCR is a reliable method for the early diagnosis of tuberculosis in children.
- This rapid diagnostic approach is highly beneficial in pediatric practice, particularly for difficult or urgent cases.
- Optimized laboratory techniques enhance the effectiveness of PCR for childhood TB diagnosis.
Objective:
To study the value of a rapid diagnostic method based on the amplification by polymerase chain reaction (PCR) of a fragment of the IS6110 insertion element for the detection of Mycobacterium tuberculosis in children.
Design:
We tested 199 specimens obtained from 68 children referred for evaluation of suspected tuberculosis.
Results:
In 83.3% of children with active disease and 38.9% with tuberculous infection but no evidence of disease, at least one positive PCR result was observed. No child without tuberculosis had positive PCR results (100% specificity). The sensitivity of the PCR was increased by testing of multiple samples from the same child and use of Chelex particles (Bio-Rad Laboratories, Ivry, France) rather than guanidine isothiocyanate-silica particles for DNA extraction. Bronchoalveolar lavage samples were no more useful than gastric aspirates.
Conclusions:
If appropriate laboratory methods are used, DNA amplification is a reliable method for the early diagnosis of tuberculosis in children and appears to be very helpful in clinical pediatric practice when the diagnosis of active tuberculosis is difficult or needs to be rapidly confirmed.