Streptococcus: Difference between revisions

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Streptococcus
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== Microbiology ==
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==Microbiology==
   
* Catalase-negative Gram positive cocci in pairs or chains
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*[[Catalase test::Catalase-negative]] [[Stain::Gram-positive]] [[Cellular shape::coccus]] in pairs or chains
* Two orthogonal classifications
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*Two orthogonal classifications
** Hemolytic properties
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**Hemolytic properties
*** Alpha: incomplete hemolysis (appears green)
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***Alpha: incomplete hemolysis (appears green)
*** Beta: complete hemolysis (appears clear)
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***Beta: complete hemolysis (appears clear)
*** Gamma: no hemolysis
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***Gamma: no hemolysis
** Lancefield antigen group (A-H)
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**Lancefield antigen group (A-H)
   
== Species ==
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==Species==
   
* Alpha-hemolytic
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*Alpha-hemolytic
** ''[[Streptococcus pneumoniae|S. pneumoniae]]'' (usually in pairs)
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**''[[Streptococcus pneumoniae|S. pneumoniae]]'' (usually in pairs)
** [[Viridans group streptococci]]
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**[[Viridans group streptococci]]
*** ''S. mitis''
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***''S. mitis''
*** ''S. oralis''
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***''S. oralis''
*** ''S. mutans''
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***''S. mutans''
*** ''S. sanguinis''
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***''S. sanguinis''
*** ''S. sobrinus''
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***''S. sobrinus''
*** Milleri group
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***Milleri group
**** ''S. anginosus''
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****''S. anginosus''
**** ''S. constellatus''
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****''S. constellatus''
**** ''S. intermedius''
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****''S. intermedius''
* Beta-hemolytic
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*Beta-hemolytic
** Group A: ''[[Streptococcus pyogenes|S. pyogenes]]''
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**Group A: ''[[Streptococcus pyogenes|S. pyogenes]]''
** Group B: ''S. agalactiae''
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**Group B: ''S. agalactiae''
** Group G: ''S. dysgalactiae''
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**Group G: ''S. dysgalactiae''
** Non-Lancefield: ''S. iniae''
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**Non-Lancefield: ''S. iniae''
* Gamma-hemolytic
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*Gamma-hemolytic
** Group D streptococci
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**Group D streptococci
*** ''[[Streptococcus bovis|S. bovis]]''
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***''[[Streptococcus bovis|S. bovis]]''
*** Previously, ''[[Enterococcus]]'' spp.
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***Previously, ''[[Enterococcus]]'' spp.
   
 
{{DISPLAYTITLE:''Streptococcus'' species}}
 
{{DISPLAYTITLE:''Streptococcus'' species}}

Revision as of 20:57, 4 August 2020

Microbiology

  • Catalase-negative Gram-positive coccus 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
  • Beta-hemolytic
    • Group A: S. pyogenes
    • Group B: S. agalactiae
    • Group G: S. dysgalactiae
    • Non-Lancefield: S. iniae
  • Gamma-hemolytic