Cardiobacterium hominis

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Gram stain Culture

General information
- the following information is not yet verified
  Taxonomy
  Family: Cardiobacteriaceae
  
  Natural habitats
  The oral cavity and nasopharynx but possibly also the gastrointestinal and urogenital tract of humans.
  
  Clinical significance
  Human disease is mainly endocarditis (HACEK), on rare occasions, they have been isolated from other body sites
Gram stain
- the following information is not yet verified
  Pleomorphic or straight Gram negative rods,
  
  0.5-0.75 x 1.0-3.0 µm
  
  with rounded ends and long filaments may occur.
  
  They are arranged singly, in pairs, in short chains and in rosette clusters
  
  Parts of the cell can stain Gram positive
Culture characteristics
- the following information is not yet verified
  
  Facultative anaerobic
  
  5% CO2 improves the growth
  
  BA: growth on blood agar is very poor.
  After incubation for two days, colonies are 1 mm, circular, smooth and opaque, and may pit the agar.
  
  Slight α-haemolysis
  
  Addition of yeast extract to the medium (e.g., chocolate agar) seems to abolish this pleomorphism
  
  McConkey: no growth
  
  BBAØ: growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition