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Streptococcus constellatus

  • General information


    • Taxonomy
      Family: Streptococcaceae

      Streptococcus anginosus group / “S. milleri” / Lancefield Group F
      - S. anginosus
      - S. constellatus
      - S. intermedius

      Natural habitats
      They are regarded generally as harmless commensals of the oropharyngeal, urogenital and gastrointestinal microbiota.

      Clinical significance
      These organisms are strongly associated with abscess formation in the brain, the oropharynx, or the peritoneal cavity.

      The S. anginosus group has been implicated as an emerging psathogen in the respiratory tract of cystic fibrosis patients.

      Specific isolation site
      - S. anginosus - urogenital or gastrointestinal tract
      - S. constellatus - respiratory tract
      - S. intermedius - abscesses of the brain or liver

  • Gram stain

    • Gram positive streptococci,

      grouped in chains

      Liquid medium,
      they are found in the form of chains of different lengths.

      They namely divide into one direction

  • Culture characteristics

    • Facultative anaerobic

      5% CO2 improves the growth

      BA: small-colony-forming bacteria (< 0.5 mm), that can display variable patterns of hemolysis (α-, β-, or γ-hemolysis)

      Colonies are 0.5-2.0 mm, white, translucent, convex, and entire, some strains produce colonies that are 0.5-1.0 mm, white and matte.

      McConkey: no growth

      BBAØ: growth (better)

      Odor: butterscotch or caramel

  • Characteristics

  • References

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