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Updated: Jul 11, 2025
Author Spotlight: Advancements in Multiplex Detection of Respiratory Viruses
Published on: November 10, 2023
Development and validation of a multiplex real-time PCR assay for detection and quantification of Streptococcus
Molly Butler1, Garrett Breazeale1,2, Eric Mwangi1
1Children's Hospital Colorado , Aurora, Colorado, USA.
Insights
A new multiplex PCR assay offers improved detection of Streptococcus pneumoniae (Spn), a leading cause of childhood respiratory infections. This molecular method provides accurate quantification for better diagnosis and research in pediatric cases.
Area of Science:
- Microbiology
- Molecular Diagnostics
- Pediatric Infectious Diseases
Background:
- Streptococcus pneumoniae (Spn) is a primary cause of pediatric lower respiratory tract infections, leading to significant morbidity and mortality.
- Current diagnostic methods for Spn, including culture and antigen testing, have limitations such as difficulty with pre-treated patients and unclear clinical utility.
- Syndromic panel testing is often less cost-effective and requires extensive validation for multiple respiratory sources compared to targeted approaches.
Purpose of the Study:
- To validate a novel multiplex PCR assay for the detection of Spn.
- To enable semi-quantitative and quantitative molecular detection of Spn from various respiratory sources.
- To provide a more effective diagnostic tool for pediatric respiratory infections.
Main Methods:
- Development and validation of a multiplex PCR assay targeting three specific genomic markers of Spn.
- Application of the assay to lower respiratory tract samples for clinical testing.
- Application of the assay to upper respiratory tract samples for research purposes.
Main Results:
- The study successfully validated the multiplex PCR assay for Spn detection.
- The assay demonstrated capability for both semi-quantitative and quantitative analysis of Spn.
- The validated assay is suitable for clinical use with lower respiratory samples and research use with upper respiratory samples.
Conclusions:
- The validated multiplex PCR assay represents a significant advancement in Spn diagnostics.
- This molecular method offers improved accuracy and utility over traditional methods for pediatric respiratory infections.
- The assay supports both clinical diagnosis and research investigations involving Spn.
Importance:
Streptococcus pneumoniae (Spn) is the world's leading cause of lower respiratory tract infection morbidity and mortality in children. However, current clinical microbiological methods have disadvantages. Spn can be difficult to grow in laboratory conditions if a patient is pre-treated, and Spn antigen testing has unclear clinical utility in children. Syndromic panel testing is less cost-effective than targeted PCR if clinical suspicion is high for a single pathogen. Also, such testing entails a full, expensive validation for each panel target if used for multiple respiratory sources. Therefore, better diagnostic modalities are needed. Our study validates a multiplex PCR assay with three genomic targets for semi-quantitative and quantitative Spn molecular detection from lower respiratory sources for clinical testing and from upper respiratory sources for research investigation.
