Prevalence, phenotype and genotype of oral enterococci

C. M. Sedgley, S. L. Lennan, D. B. Clewell

Research output: Contribution to journalArticlepeer-review

119 Scopus citations


This study investigated the prevalence, phenotype and genotype of oral enterococci. Enterococci were detected in oral rinse samples from 11% of 100 patients receiving endodontic treatment and 1% of 100 dental students with no history of endodontic treatment (P = 0.0027). All enterococcal isolates were identified as Enterococcus faecalis. Viable counts ranged from 1 × 10 to 6 × 103 colony forming units per mL of oral rinse sample. Potential virulence traits expressed by oral E. faecalis strains included production of hemolysin (n = 4) and gelatinase (n = 4), and response to pheromones in E. faecalis culture filtrate (n = 1). Six strains produced bacteriocin. All strains were susceptible to ampicillin, benzylpenicillin, gentamicin and vancomycin. There was no evidence of metal-ion resistance. One isolate produced hemolysin, gelatinase and bacteriocin, was resistant to several antibiotics, and responded to the pheromone cPD1. Pulsed-field gel electrophoresis and plasmid analysis showed that oral E. faecalis exhibited widespread genetic polymorphism, with plasmids detected in seven strains.

Original languageEnglish (US)
Pages (from-to)95-101
Number of pages7
JournalOral microbiology and immunology
Issue number2
StatePublished - Apr 2004
Externally publishedYes


  • Genotype
  • Oral enterococci
  • Phenotype
  • Prevalence

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Dentistry(all)
  • Microbiology (medical)


Dive into the research topics of 'Prevalence, phenotype and genotype of oral enterococci'. Together they form a unique fingerprint.

Cite this