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Virulence factors in uropathogenic E. coli.

S N Shrikhande1, C A Chande, A A Pathak

  • 1Department of Microbiology, Govt. Medical College, Nagpur, M.S., India.

Indian Journal of Pathology & Microbiology
|June 22, 2000
PubMed
Summary
This summary is machine-generated.

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Uropathogenic Escherichia coli strains show increased adherence to uroepithelial cells and mannose-resistant hemagglutination compared to fecal strains. Serogroup O4 was the most frequent among these virulent E. coli.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Urology

Background:

  • Escherichia coli (E. coli) strains causing urinary tract infections (UTIs) possess distinct virulence factors compared to fecal strains.
  • Key virulence factors include adherence to uroepithelial cells, lipopolysaccharide O antigen type, and mannose-resistant hemagglutination.

Purpose of the Study:

  • To investigate and compare the adherence and hemagglutination properties of E. coli strains isolated from UTIs versus healthy fecal samples.
  • To identify common E. coli serogroups associated with urinary tract infections.

Main Methods:

  • Studied 100 E. coli strains from symptomatic UTIs and control fecal samples.
  • Assessed adherence to uroepithelial cells and hemagglutination of human erythrocytes.
  • Determined mannose resistance of hemagglutination and identified E. coli serogroups.

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Main Results:

  • 58 uropathogenic E. coli strains exhibited high adherence to uroepithelial cells; 28 showed moderate adherence.
  • 70 uropathogenic strains induced hemagglutination, with 32 showing D-mannose resistance.
  • Control fecal strains showed significantly lower adherence and mannose-resistant hemagglutination (1 of 28).
  • Serogroup O4 was most frequent (12%) in uropathogenic isolates, followed by O101, O135, and O6.

Conclusions:

  • Uropathogenic E. coli strains possess enhanced adherence and hemagglutination capabilities, indicating their role in UTI pathogenesis.
  • Specific E. coli serogroups, particularly O4, are frequently associated with urinary tract infections.