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Cardiobacterium hominis

  • 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

      Growth on blood agar is very poor.
      After incubation for two days, colonies are 1 mm, circular, smooth, butyrous 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


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