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Antibiotic resistance genes in anaerobic bacteria isolated from primary dental root canal infections.

Abstract：

:Fourty-one bacterial strains isolated from infected dental root canals and identified by 16S rRNA gene sequence were screened for the presence of 14 genes encoding resistance to beta-lactams, tetracycline and macrolides. Thirteen isolates (32%) were positive for at least one of the target antibiotic resistance genes. These strains carrying at least one antibiotic resistance gene belonged to 11 of the 26 (42%) infected root canals sampled. Two of these positive cases had two strains carrying resistance genes. Six out of 7 Fusobacterium strains harbored at least one of the target resistance genes. One Dialister invisus strain was positive for 3 resistance genes, and 4 other strains carried two of the target genes. Of the 6 antibiotic resistance genes detected in root canal strains, the most prevalent were blaTEM (17% of the strains), tetW (10%), and ermC (10%). Some as-yet-uncharacterized Fusobacterium and Prevotella isolates were positive for blaTEM, cfxA and tetM. Findings demonstrated that an unexpectedly large proportion of dental root canal isolates, including as-yet-uncharacterized strains previously regarded as uncultivated phylotypes, can carry antibiotic resistance genes.

journal_name

Anaerobe

journal_title

Anaerobe

authors

Rôças IN,Siqueira JF Jr

doi

10.1016/j.anaerobe.2012.10.001

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

576-80

issue

6

eissn

1075-9964

issn

1095-8274

pii

S1075-9964(12)00142-4

journal_volume

18

pub_type

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