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Listeria ivanovii

  • General information

    • the following information is not yet verified
      Taxonomy
      Family: Listeriaceae

      Of the seven species within the genus Listeria, only L. monocytogenes and L. ivanovii are pathogenic.

      Natural habitats
      They are widely distributed in the environment

      Clinical significance
      Listeria ivanovii is primarily a pathogen of ruminants.

      Systemic infections in immunodeficiency virus-infected and non-immunosuppressed patients have, however been described.

  • Gram stain

    • the following information is not yet verified
      Regular, short gram positive rods,

      0.4-0.5 x 0.5-2.0 µm,

      that occur singly or in short chains.

      Filaments of 6-20 µm, may occur in older or rough cultures.

      Listeria may be confused with members of the coryneform rods (especially in direct slides from blood cultures), since the cells may be arranged in V forms or palisades.

  • Culture characteristics

    • the following information is not yet verified

      Facultative anaerobic

      5% CO2 stimulates growth

      Colonies are small, smooth, white-grey and produce a wide zone of hemolysis.

      McConkey growth

      BBAØ growth

      CAMP-test
      L.ivanovii ►CAMP-test negative (S.aureus streak)
      L.ivanovii ►CAMP-test positive (R.equi streak = a shovel shape)

  • Characteristics

  • References

    • James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition


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