Citrobacter species


  • Enteric aerobic Gram-negative bacilli [Fig 1], a normal part of gut flora.
  • Can be mistakenly identified as Salmonella; colonies on plates [Fig 2] resemble E. coli.
  • Species associated w/ infection most commonly C. freundii, C. amalonaticus and C. koseri (previously known as C. diversus).
    • C. braakii, a member of the C. freundii complex, is described as causing infection, mainly in immunocompromised patients.
  • Commonly found in soil, water, foodstuffs and normal inhabitant of gut flora in humans and animals.

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Last updated: April 3, 2021