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Related Experiment Videos

Platelet aggregation by oral streptococci.

C W Douglas1, P R Brown, F E Preston

  • 1Department of Oral Pathology, University of Sheffield, U.K.

FEMS Microbiology Letters
|October 1, 1990
PubMed
Summary
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Certain Streptococcus sanguis strains aggregate platelets, a key factor in infective endocarditis. However, this platelet aggregation ability is not essential for causing endocarditis, suggesting it

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Bacterial Pathogenesis

Background:

  • Infective endocarditis pathogenesis involves bacterial interaction with host factors.
  • Platelet aggregation by bacteria is a proposed mechanism in infective endocarditis.
  • Recent taxonomic changes in Streptococcus species complicate previous findings.

Purpose of the Study:

  • To investigate the platelet aggregation ability of various Streptococcus species, including recent clinical isolates.
  • To determine if platelet aggregation is a conserved trait within Streptococcus sanguis.
  • To assess the role of platelet aggregation as a virulence factor in infective endocarditis.

Main Methods:

  • Tested 24 laboratory strains and 8 clinical isolates of Streptococcus for platelet aggregation.

Related Experiment Videos

  • Utilized genetically grouped laboratory stock strains for comprehensive analysis.
  • Compared aggregation capabilities across different species: S. sanguis, S. gordonii, S. parasanguis, S. mitis, and S. oralis.

    • Main Results:

    • Only Streptococcus sanguis strains demonstrated the ability to aggregate platelets.
    • Streptococcus gordonii, S. parasanguis, S. mitis, S. oralis, and related taxa did not aggregate platelets.
    • Preliminary data suggest some Streptococcus sanguis biotypes lack platelet aggregation ability.
    • Of 8 clinical isolates, only 4 aggregated platelets, all exhibiting S. sanguis phenotypes.

    Conclusions:

    • Platelet aggregation is a specific trait of certain Streptococcus sanguis strains.
    • This ability is not universally present in all S. sanguis strains or essential for causing endocarditis.
    • Platelet aggregation may represent a significant, but not indispensable, virulence factor in infective endocarditis.