Streptococcus: Difference between revisions

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Streptococcus
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== Microbiology ==
==Microbiology==


* Catalase-negative Gram positive cocci in pairs or chains
*[[Catalase test::Catalase-negative]] [[Stain::Gram-positive]] [[Cellular shape::coccus]] in pairs or chains
* Two orthogonal classifications
*Two orthogonal classifications
** Hemolytic properties
**Hemolytic properties
*** Alpha: incomplete hemolysis (appears green)
***Alpha: incomplete hemolysis (appears green)
*** Beta: complete hemolysis (appears clear)
***Beta: complete hemolysis (appears clear)
*** Gamma: no hemolysis
***Gamma: no hemolysis
** Lancefield antigen group (A-H)
**Lancefield antigen group (A-H)


== Species ==
==Species==


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


{{DISPLAYTITLE:''Streptococcus'' species}}
{{DISPLAYTITLE:''Streptococcus'' species}}

Revision as of 00:57, 5 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