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Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
Published on: February 24, 2014
Sequential multiplex PCR assay for determining capsular serotypes of colonizing S. pneumoniae
Sarah Jourdain1, Pierre-Alexandre Drèze, Jozef Vandeven
1Laboratoire de Génétique et Physiologie Bactérienne, Institut de Biologie et de Médecine Moléculaires, Université Libre de Bruxelles, Bruxelles, Belgium. sajourda@ulb.ac.be
BMC Infectious Diseases
|April 22, 2011
Summary
A new multiplex PCR assay accurately identifies Streptococcus pneumoniae serotypes from nasopharyngeal carriage. This cost-effective method offers a reliable alternative to traditional techniques for monitoring pneumococcal vaccine effectiveness.
Area of Science:
- Microbiology
- Molecular Biology
- Public Health
Background:
- Asymptomatic nasopharyngeal carriage of Streptococcus pneumoniae is a key indicator for tracking serotype distribution.
- Evaluating the impact of pneumococcal vaccines relies on accurate serotype determination.
- Conventional methods like the Quellung reaction are labor-intensive and costly.
Purpose of the Study:
- To develop and validate a novel multiplex PCR assay for efficient pneumococcal serotyping.
- To provide a simple, economical, and reliable alternative to conventional serotyping methods.
Main Methods:
- A multiplex PCR assay was designed for the detection of 30 common Streptococcus pneumoniae serogroups/types.
- The assay utilizes 7 consecutive PCR reactions.
- Validation was performed on a collection of 332 S. pneumoniae isolates from a Belgian prospective study.
Main Results:
- The multiplex PCR assay successfully typed over 94% of the collected Streptococcus pneumoniae isolates.
- Seventy-five percent of isolates were identified after only 3 PCR reactions.
- The PCR assay results demonstrated strong agreement with the conventional Quellung reaction identification.
Conclusions:
- The developed multiplex PCR assay is an accurate and dependable method for Streptococcus pneumoniae serotyping.
- This novel assay can effectively replace conventional methods in pneumococcal carriage studies.
- The method facilitates more efficient monitoring of pneumococcal serotype distribution and vaccine efficacy.
