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Citrobacter koseri

  • General information

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

      C.freundii complex
      -- C. freundii, C. braakii, C. gilleni, C. murlinae, C. sedlakii, C. werkmanii, C. youngae
      C. koseri (C. diversus)
      C. amalonaticus
      C. farmeri

      Natural habitats
      Isolated from soil, water, food, feces, urine of humans and animals.
      They are commensals of the intestine.

      The natural habitat of some Citrobacter species is unknown.

      Clinical significance
      Citrobacter species cause a wide variety of nosocomial infections, including infections of the respiratory- and urinary tract, blood, wounds, bone, meninges and other normally sterile tissues.

      Especially patients which are hospitalized for more than 72 hours and immunocompromised patients are at risk for an infection caused by Citrobacter.

      In many cases the infection arises from the gastrointestinal or genitourinary tract.

  • Gram stain

    • the following information is not yet verified
      Gram negative straight rods,

      1.0 x 2.0-6.0 µm,

      found singly or in pairs.

      Usually not encapsulated

  • Culture characteristics

    • the following information is not yet verified

      Facultative anaerobic

      Colonies are 2-4 mm, smooth, low convex, moist, translucent or opaque, and gray with a shiny surface.
      Mucoid or rough forms may occur.

      McConkey growth, lactose fermenter

      BBAØ growth

      Mucoid or rough strains may occur occasionally.

      Colonies which slowly ferment lactose can resemble Salmonella colonies on enteric media.

  • Characteristics

  • References

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


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