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Molecular typing of Chinese Streptococcus pyogenes isolates

Yuanhai You1, Haibin Wang2, Zhenwang Bi3

  • 1State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, 102206, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou, 310003, China.

Molecular and Cellular Probes
|April 7, 2015
PubMed

Insights

Multiple-locus variable-number tandem-repeat analysis (MLVA) effectively genotypes Streptococcus pyogenes clinical isolates. This molecular typing method offers superior discrimination compared to emm typing and pulsed field gel electrophoresis (PFGE) for epidemiological surveillance.

Area of Science:

  • Microbiology
  • Epidemiology
  • Molecular Biology

Background:

  • Streptococcus pyogenes causes a spectrum of human infections, from mild to life-threatening.
  • Accurate genotyping is crucial for tracking S. pyogenes outbreaks and understanding disease transmission.

Purpose of the Study:

  • To compare the discriminatory power of multiple-locus variable-number tandem-repeat analysis (MLVA) against emm typing and pulsed field gel electrophoresis (PFGE).
  • To evaluate MLVA as an epidemiological tool for genotyping Chinese S. pyogenes isolates.

Main Methods:

  • emm typing and pulsed field gel electrophoresis (PFGE) were performed using standard protocols.
  • Seventeen geographically diverse Chinese S. pyogenes isolates were genotyped using seven VNTR loci for MLVA.

Main Results:

  • MLVA demonstrated superior discriminatory capacity for S. pyogenes isolates compared to emm typing and PFGE.
  • Excluding the Spy2 VNTR locus minimally impacted typing sensitivity (0.7%), indicating its limited informativeness in this isolate set.

Conclusions:

  • MLVA is a powerful and effective tool for the epidemiological genotyping of S. pyogenes clinical isolates.
  • The findings support the routine use of MLVA in public health surveillance for S. pyogenes.
Keywords:
MLVAMolecular typingMultiple-locus variable-number tandem-repeat analysisStreptococcus pyogenes

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