Streptococcus

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Streptococcus /

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Microbiology

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

Species

Streptococcus pneumoniae (alpha-hemolytic, usually in pairs)
Viridans group streptococci
Pyogenic group
- Streptococcus pyogenes (beta-hemolytic, group A)
- Streptococcus canis
- Streptococcus urinalis
- Streptococcus dysgalactiae (beta-hemolytic, group G)
  - Streptococcus dysgalactiae subspecies dysgalactiae
  - Streptococcus dysgalactiae subspecies equisimilis
- Streptococcus agalactiae (beta-hemolytic, group B)
- Streptococcus porcinus
- Streptococcus parauberis
- Streptococcus uberis
- Streptococcus iniae
Streptococcus bovis group (gamma-hemolytic, Group D)
Other streptococci

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Gram-positive cocci