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Streptococcus dysgalactiae ssp equisimilis

  • General information

    • the following information is not yet verified
      Taxonomy
      Family: Streptococcaceae

      Streptococcus dysgalactiae ssp equisimilis = Lancefield Group A, C, G or L

      Natural habitats

      Are normal commensal flora of the human upper airway and frequently are asymptomatic colonizers of the skin, gastrointestinal tract and female genital tract.

      Clinical significance
      After being considered nonpathogenic for many years, they are now recognized as an important bacterial pathogen.

      The clinical spectrum of diseases caused by this species closely resembles Streptococcus pyogenes infections.

      S. dysgalactiae ssp equisimilis and S.pyogenes share virulence factors.
      The M protein is an important virulence factor because it confers resistance to phagocytosis

      They are also implicated in mono- and polymicrobial infections of the skin and soft tissues, pharyngitis, bacteremia and endocarditis, septic arthritis and osteomyelitis, puerperal infections, and meningitis.

  • Gram stain

    • the following information is not yet verified
      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

    • the following information is not yet verified

      Beta-hemolytic streptococci of the pyogenic group (S. pyogenes, S. agalactiae, and S. dysgalactiae ssp equisimilis) form colonies > 0.5 mm

      Viridans streptococci form colonies < 0.5 mm

      Facultative anaerobic


      5% CO2 improves the growth

      Colonies > 0.5 mm after 24 hours of incubation.

      They appear grey or almost white, moist or glistening with a wide zone of hemolysis.

      McConkey no growth

      BBAØ growth

  • Characteristics

  • References


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