Eikenella species


  • Facultatively anaerobic, fastidious, Gram-negative coccobacillary organism [Fig 1].
    • Pits agar on culture plates [Fig 2, note: only ~50% of such colonies produce this pitting].
    • Grows best if enhanced by 3-10% CO2.
  • Eikenella corrodens is the primary human pathogen.
    • Other species members described as rarely causing human illness are E. halliae sp. nov., and E. exigua sp. nov.
  • Often found as a component of mixed infections.
  • Member of the HACEK group of endocarditis-associated bacteria (Haemophilus spp., Actinobacillus, Cardiobacterium, Eikenella, Kingella).

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Last updated: January 11, 2023