Johns Hopkins ABX Guide
Eikenella species
MICROBIOLOGY
- 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
Citation
Auwaerter, Paul G. "Eikenella Species." Johns Hopkins ABX Guide, The Johns Hopkins University, 2023. Pediatrics Central, peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540186/all/Eikenella_species.
Auwaerter PG. Eikenella species. Johns Hopkins ABX Guide. The Johns Hopkins University; 2023. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540186/all/Eikenella_species. Accessed November 4, 2025.
Auwaerter, P. G. (2023). Eikenella species. In Johns Hopkins ABX Guide. The Johns Hopkins University. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540186/all/Eikenella_species
Auwaerter PG. Eikenella Species [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2023. [cited 2025 November 04]. Available from: https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540186/all/Eikenella_species.
* Article titles in AMA citation format should be in sentence-case
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T1 - Eikenella species
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PB - The Johns Hopkins University
DB - Pediatrics Central
DP - Unbound Medicine
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