Related Experiment Video
Updated: Mar 30, 2026
Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
Published on: February 24, 2014
Capsular typing of Streptococcus pneumoniae isolated in an Algerian hospital using a new multiplex PCR-based scheme
Hanifa Ziane1, Vera Manageiro2, Eugénia Ferreira3
1Service de Microbiologie Clinique, Centre Hospitalo-Universitaire Mustapha Bacha, Faculté de Médecine, Algiers, Algeria.
Abstract:
We developed a new sequential multiplex-PCR-based typing scheme (MPBTS) for pneumococcal capsular classification. The serogroup/type of 37 control isolates obtained by the Quellung reaction, MPBTS, and nucleotide sequencing, were fully concordant. The serogroups/types of 75 invasive isolates determined by MPBTS, presented 100% specificity and 96% sensitivity, when compared with the Quellung reaction.
Insights
A new multiplex PCR-based typing scheme accurately classifies pneumococcal capsular serogroups/types. This method shows high concordance and sensitivity compared to traditional methods for invasive isolates.
Area of Science:
- Microbiology
- Molecular Biology
- Vaccinology
Background:
- Accurate pneumococcal capsular classification is crucial for disease surveillance and vaccine development.
- Traditional methods like Quellung reaction can be labor-intensive and require specialized expertise.
Purpose of the Study:
- To develop and validate a novel sequential multiplex PCR-based typing scheme (MPBTS) for pneumococcal capsular serogroup/type determination.
- To assess the concordance and diagnostic accuracy of MPBTS against established methods.
Main Methods:
- Development of a sequential multiplex PCR-based typing scheme (MPBTS).
- Validation using 37 control isolates compared with Quellung reaction and nucleotide sequencing.
- Testing on 75 invasive pneumococcal isolates, comparing MPBTS results with the Quellung reaction.
Main Results:
- Full concordance observed between MPBTS, Quellung reaction, and nucleotide sequencing for 37 control isolates.
- MPBTS demonstrated 100% specificity and 96% sensitivity for serogroup/type determination in 75 invasive isolates compared to the Quellung reaction.
Conclusions:
- The developed MPBTS is a reliable and accurate method for pneumococcal capsular classification.
- MPBTS offers a sensitive and specific alternative to traditional methods for typing pneumococcal isolates.
