Streptococcus: Difference between revisions

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Streptococcus
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Streptococcus

Classification

  • Catalase-negative Gram positive cocci in pairs or chains
  • Two orthogonal classifications
    • Hemolytic properties
      • Alpha: incomplete hemolysis (appears green)
      • Beta: complete hemolysis (appears clear)
      • Gamma: no hemolysis
    • Lancefield antigen group (A-H)

Species

  • Alpha-hemolytic
    • S. pneumoniae (usually in pairs)
    • Viridans group streptococci
      • S. mitis
      • S. oralis
      • S. mutans
      • S. sanguinis
      • S. sobrinus
      • Milleri group
        • S. anginosus
        • S. constellatus
        • S. intermedius
  • Beta-hemolytic
    • Group A: S. pyogenes
    • Group B: S. agalactiae
    • Group G: S. dysgalactiae
    • Non-Lancefield: S. iniae
  • Gamma-hemolytic
    • Group D streptococci
      • S. bovis
      • Previously, Enterococcus spp.