- Oral Microbiome Library
- Gums
- E. corrodens
Eikenella corrodens
Also called the slow grower
- Evidence
- Limited evidenceLimited · Green-complex member · Mostly case reports beyond the mouth
- Class
- Bacterium · Gum pocket · panel code Ec
- Sources
- 3 peer-reviewed sources
Key takeaway
E. corrodens is a normal, slow-growing mouth resident that pits agar plates as it grows, hence the name. It belongs to the green complex of plaque and is a well-known cause of stubborn infections when it gets out of the mouth, from bite wounds to heart valves [1][2].
| What it is | A small, Gram-negative, facultative rod; a member of the HACEK group of slow-growing organisms. |
|---|---|
| Where it lives | Plaque and gum pockets, part of the normal flora. |
| Role in the mouth | Contributes to periodontal infections as part of a mixed community [2]. |
| Beyond the mouth | Human-bite and clenched-fist infections, abscesses, and endocarditis, mostly in case reports [2][3]. |
| Evidence strength | Limited evidence. Mostly case reports, small samples or lab and animal work. |
| How we measure it | Quantitative PCR (qPCR) on your saliva sample, reported as genomic copies per mL against a reference range. Ranges are for context, not diagnostic cut-offs. |
What is Eikenella corrodens?
E. corrodens is part of the normal mouth flora and was placed in Socransky’s green complex, a group with a weaker link to disease than the orange and red complexes [1].
Clinically it is better known outside the mouth. A 1992 review catalogued it in periodontal abscesses, head and neck infections, bite wounds and endocarditis, usually alongside other bacteria [2].
How does E. corrodens work?
It is not a heavy toxin producer. Its role is mostly as a co-infector: it grows slowly, tolerates the pocket environment and persists in mixed infections that are hard to clear [2].
What does the research show?
The periodontal association is modest and it is common in health, which is why we grade the evidence limited. Outside the mouth, the literature is dominated by case reports and series, including a paediatric review of bite-related and other infections [3].
What does a result mean?
A detected level is information for your dentist, not a diagnosis of gum disease. Periodontitis is diagnosed by probing, bleeding and bone loss on an exam, and this result is read alongside that.
On its own, an elevated level is a minor signal. It adds context when the orange and red complexes are also raised [1].
Frequently asked questions
Why is it called corrodens?
Because colonies pit, or “corrode”, the surface of the agar they grow on [2].
Sources
- Socransky SS, Haffajee AD, Cugini MA, et al.. Microbial complexes in subgingival plaque. J Clin Periodontol 1998. DOI: 10.1111/j.1600-051x.1998.tb02419.xPMID 9495612
- Chen CK, Wilson ME. Eikenella corrodens in human oral and non-oral infections: a review. J Periodontol 1992. DOI: 10.1902/jop.1992.63.12.941PMID 1474466
- Paul K, Patel SS. Eikenella corrodens infections in children and adolescents: case reports and review of the literature. Clin Infect Dis 2001. DOI: 10.1086/320883PMID 11389495
This page is educational and does not constitute medical or dental advice, a diagnosis, or a health claim. The OneOral Bio Test reports the organisms and measurements present in a saliva sample; reference ranges are for context only and are not diagnostic thresholds. A licensed dentist reviews results in the context of your examination and history. Content reviewed by the OneOral Clinical Team; research summaries reflect the cited sources as of Oct 27, 2026.