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Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
Published on: February 24, 2014
Modified sequential multiplex PCR for determining capsular serotypes of invasive pneumococci recovered from Seville
P Iraurgui1, M J Torres, A Gandia
1Microbiology Service, Hospital Universitario Virgen del Rocío, Sevilla, Spain.
Summary
A modified multiplex PCR scheme effectively identifies Streptococcus pneumoniae serotypes in clinical isolates. This method adapts to local prevalence, improving typing efficiency for both adult and pediatric invasive pneumococcal disease surveillance.
Area of Science:
- Microbiology
- Molecular Biology
- Epidemiology
Background:
- The heptavalent pneumococcal vaccine reduced invasive pneumococcal disease but increased non-vaccine serotypes.
- Accurate serotyping of Streptococcus pneumoniae is crucial for disease surveillance and vaccine effectiveness monitoring.
Purpose of the Study:
- To evaluate a modified sequential multiplex PCR scheme for identifying capsular serotypes of invasive Streptococcus pneumoniae isolates.
- To adapt the PCR scheme to the specific serotype prevalence observed in Seville, Spain.
Main Methods:
- Sequential multiplex PCR assays were optimized and applied to clinical isolates of Streptococcus pneumoniae.
- The scheme was designed to target serotypes prevalent in the Seville region.
Main Results:
- The modified scheme achieved high typing rates: 73% in adults and 73.5% in pediatric patients with the initial three PCR reactions.
- With two additional PCR reactions, typing rates increased to 92% in adults and 90% in pediatric patients.
- The multiplex PCR approach demonstrated successful adaptation to the prevalent serotypes in Seville.
Conclusions:
- The adapted multiplex PCR scheme is an efficient tool for serotyping Streptococcus pneumoniae invasive clinical isolates.
- This method enhances surveillance capabilities by accurately identifying circulating serotypes, including non-vaccine types.
- The study highlights the importance of regionally adapted diagnostic tools for infectious disease monitoring.
