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Related Experiment Videos

Using cpsA-cpsB sequence polymorphisms and serotype-/group-specific PCR to predict 51 Streptococcus pneumoniae

Fanrong Kong1, Gwendolyn L Gilbert1

  • 1Centre for Infectious Diseases and Microbiology (CIDM), Institute of Clinical Pathology and Medical Research (ICPMR), Westmead Hospital, Darcy Rd, Westmead, New South Wales, 2145 Australia.

Journal of Medical Microbiology
|November 14, 2003
PubMed
Summary

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A new molecular capsular typing (MCT) method accurately predicts most Streptococcus pneumoniae serotypes, aiding invasive pneumococcal disease surveillance. This objective method combines gene sequencing and PCR for enhanced epidemiological studies.

Area of Science:

  • Microbiology
  • Vaccinology
  • Epidemiology

Background:

  • Pneumococcal vaccines target common Streptococcus pneumoniae serotypes, necessitating ongoing surveillance of invasive pneumococcal disease.
  • Monitoring serotype distribution changes is crucial for public health and vaccine efficacy assessment.

Purpose of the Study:

  • To develop and evaluate a molecular capsular typing (MCT) system for Streptococcus pneumoniae.
  • To compare the accuracy and efficiency of MCT against conventional serotyping (CS) methods.

Main Methods:

  • Developed MCT based on partial cpsA-cpsB gene sequencing and serotype-specific PCR targeting wzy and wzx genes.
  • Evaluated MCT using 151 S. pneumoniae isolates of known serotype and 276 recent clinical isolates (total 427).
  • Analyzed 376 heterogeneity sites in the cpsA-cpsB region to identify sequence types (STs).

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Main Results:

  • Identified 89 sequence types (STs), with 76 corresponding to single serotypes and 11 containing mixed serotypes.
  • MCT accurately predicted serotypes for most isolates, with limited conventional serotyping (CS) needed for 22% of isolates with mixed STs.
  • Serotype 23F-specific PCR resolved ambiguities in two mixed STs.

Conclusions:

  • Molecular capsular typing (MCT) is a specific, objective, and practical method for predicting S. pneumoniae serotypes.
  • MCT facilitates epidemiological studies of invasive pneumococcal disease.
  • Further research is needed to refine MCT and understand its relationship with CS for improved serotype differentiation.