Streptococcus gallolyticus

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Gram stain Culture

General information
- Taxonomy Family: Streptococcaceae Strepytococcus bovis group / Lancefield Group D
  
  Former name Current name
  
  S. bovis biotype I S. gallolyticus
  
  S. bovis biotype II.1 S. infantarius
  
  S. bovis biotype II.2 S. gallolyticus ssp pasteurianus
  
  Natural habitats
  Is part of the human gastrointestinal microbiota
  
  Clinical significance
  Species from this group are frequently encountered in blood cultures of patients with bacteremia, sepsis and endocarditis.
  
  The clinical significance of blood cultures growing streptococci from the S.bovis group lies in the association of
  
  S. gallolyticus ssp gallolyticus with gastrointestinal cancer
  
  and of
  
  S. gallolyticus ssp pasteurianus with meningitis.
Gram stain
- Gram positive oval streptococci, in pairs or chains
Culture characteristics
- Facultative anaerobic 5% CO2 improves the growth BA: colonies are small, grey and non-hemolytic or α-hemolytic
  
  McConkey: growth
  
  BBAØ: growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition