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Related Experiment Videos

Streptococcus suis in Hong Kong.

Margaret Ip1, Kitty S C Fung, Fang Chi

  • 1Department of Microbiology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong. margaretip@cuhk.edu.hk

Diagnostic Microbiology and Infectious Disease
|July 25, 2006
PubMed
Summary

Streptococcus suis was found in Hong Kong raw pork, primarily in specific cuts like tongue and tail. Human clinical isolates of S. suis were distinct from pork strains, suggesting different sources for infections.

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Area of Science:

  • Microbiology
  • Food Safety
  • Veterinary Public Health

Background:

  • Streptococcus suis is a zoonotic pathogen causing significant human and animal disease.
  • Understanding the prevalence and characteristics of S. suis in food sources is crucial for public health.
  • Limited data exists on S. suis in raw pork within Hong Kong's wet market system.

Purpose of the Study:

  • To investigate the presence and characteristics of Streptococcus suis in raw pork sold in Hong Kong.
  • To compare pork-associated S. suis isolates with clinical strains causing human infections in Hong Kong.
  • To evaluate molecular methods for S. suis surveillance.

Main Methods:

  • Bacteriological isolation and identification of Streptococcus suis from raw pork samples.

Related Experiment Videos

  • Polymerase chain reaction (PCR) for S. suis confirmation.
  • Serotyping using specific antisera.
  • Phylogenetic analysis of isolates.
  • Pulsed-field gel electrophoresis (PFGE) for characterizing clinical S. suis strains.

    • Main Results:

    • Streptococcus suis was isolated from 6.1% of raw pork samples across three wet markets.
    • Isolates were predominantly found in tongue, tonsil, bone, and tail, not lean meat or organs.
    • Pork isolates were not serotype 2 and phylogenetically distinct from common serotypes.
    • Clinical S. suis strains from human sepsis/meningitis were all serotype 2 and genetically distinct from pork isolates.

    Conclusions:

    • Non-serotype 2 Streptococcus suis strains are present in Hong Kong's raw pork supply.
    • Serotype 2 S. suis strains, responsible for human invasive infections in Hong Kong, appear to originate from sources other than the studied raw pork.
    • Molecular typing methods are valuable tools for differentiating foodborne and clinical S. suis strains.