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Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species
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Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species

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Subspecies typing of Vibrio parahaemolyticus by pulsed-field gel electrophoresis

H C Wong1, K T Lu, T M Pan

  • 1Department of Microbiology, Soochow University, Taipei, Taiwan. wonghc@mbml.scu.edu.tw

Journal of Clinical Microbiology
|June 1, 1996
PubMed

Insights

A new pulsed-field gel electrophoresis (PFGE) method effectively types Vibrio parahaemolyticus, a significant food-borne pathogen. This molecular typing revealed distinct genetic profiles among isolates from Taiwan, aiding in understanding pathogen diversity and origins.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Food Safety

Background:

  • Vibrio parahaemolyticus is a major food-borne pathogen in coastal regions, particularly Taiwan and Japan.
  • Accurate molecular typing is crucial for tracking outbreaks and understanding the epidemiology of V. parahaemolyticus.

Purpose of the Study:

  • To develop and validate a pulsed-field gel electrophoresis (PFGE) method for molecular typing of Vibrio parahaemolyticus.
  • To characterize clinical isolates of V. parahaemolyticus from Taiwan using the developed PFGE method.

Main Methods:

  • Genomic DNA from V. parahaemolyticus isolates was digested with SfiI.
  • DNA fragments were separated using 1% agarose gel electrophoresis with a contour-clamped homogeneous electric field (CHEF) apparatus.
  • Optimized electrophoresis conditions included 190 V and a pulse time ranging from 3 to 80 seconds.

Main Results:

  • The PFGE method successfully differentiated 130 V. parahaemolyticus isolates from Taiwan outbreaks (1993-1994) into 14 distinct PFGE types, identifying a total of 39 unique patterns.
  • Most domestic clinical isolates clustered into major types (A, B, C, G), showing limited similarity to foreign and environmental strains.
  • A Japanese strain (CCRC12863) exhibited close genetic relatedness to domestic isolates (PFGE types F, G, H), suggesting potential clonal links.

Conclusions:

  • The developed PFGE method is a robust tool for molecular typing of Vibrio parahaemolyticus.
  • The study identified distinct genetic clusters among Taiwanese clinical isolates and suggested a clonal relationship with a Japanese strain.
  • This molecular epidemiology approach aids in understanding the population structure and transmission dynamics of V. parahaemolyticus.

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