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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 18, No. 3, 2015, pp. 175-180
Bioline Code: ej15030
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 18, No. 3, 2015, pp. 175-180

 en Clonal diversity and antimicrobial resistance of Enterococcus faecalis check for this species in other resources isolated from endodontic infections
Al-Badah, Abdulhakim Suliman; Ibrahim, Abdelnasser S.S.; Al-Salamah, Ali A. & Ibrahim, Shebl Salah S.


Background: Enterococcus faecalis check for this species in other resources is considered to be one ofmost prevalent species in the oral cavity, particularly in endodontic infections. The aim of the present study was to investigate the prevalence of E. faecalis in dental root canals, clonal diversity by restriction fragment length polymorphism (RFLP) and randomly amplified polymorphic DNA (RAPD-PCR) analysis, and the antibiotic susceptibility of E. faecalis isolates.
Results: Among the bacterial strains isolated from dental root canal specimens (n = 82), E. faecalis was determined to have the highest prevalence followed by Streptococcus viridians, Leuconostoc mesenteroides check for this species in other resources , Staphylococcus aureus check for this species in other resources , Streptococcus mitis check for this species in other resources , and Pediococcus pentosaceus check for this species in other resources . Cluster analysis of RAPD-PCR and RFLP patterns of the E. faecalis isolates discriminated five and six different genotypes, respectively. Among the tested strains, 43%, 52% and 5% were susceptible, intermediate resistant, and resistant to erythromycin, respectively. In addition, one strain (E-12) was intermediate resistant to linezolid, and one isolate (E-16) was resistant to tetracycline. Interestingly, many of the intermediate resistant/resistant strains were grouped in clusters 5 and 6, according RAPD and to RFLP, respectively.
Conclusions: E. faecalis demonstrated the highest prevalence in the tested dental root canal specimens collected from Saudi patients and were grouped into five to six different genotypes. Different levels of antimicrobial susceptibility were observed in the tested E. faecalis strains, which clearly indicated that although bacterial strains may be similar, point mutations can result in extreme susceptibility or resistance to various antibiotics. This phenomenon is a cause for concern for clinicians in the treatment of dental infections caused by E. faecalis.

Antimicrobial susceptibility; Endodontic infection; Enterococcus faecalis; Genotype; RAPD; RFLP

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