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http://dx.doi.org/10.7845/kjm.2013.3025

Distribution of Multidrug Efflux Pump Genes in Enterococci spp. Isolated from Bovine Milk Samples and Their Antibiotic Resistance Patterns  

Kang, SoWon (Division of Animal Science, Sahmyook University)
Lee, SangJin (Division of Animal Science, Sahmyook University)
Choi, SungSook (College of Pharmacy, Sahmyook University)
Publication Information
Korean Journal of Microbiology / v.49, no.2, 2013 , pp. 126-130 More about this Journal
Abstract
The major aim of this study was to investigate the distribution of genes that encode multidrug efflux pumps in Enterococci spp. isolates from bovine milk samples and antibiotic resistance patterns of these strains. Of the 245 isolates, 44.1% showed ampicillin resistance, 79.2% showed erythromycin resistance, 76.3% showed tetracycline resistance and 36.3% showed chloramphenicol resistance. In case of vancomycin and ciprofloxacin, all of the isolates were susceptible to these antibiotics. Of the 245 enterococcal isolates, 82.1% have MFS type eme(A) gene, 72.7% have ABC type efr(A) gene, 77.1% have ABC type efr(B) gene, and 71.8% have ABC type lsa gene. In case of Enterococcus faecalis, the original strain for these genes, 92.5% have eme(A), 87.4% have efr(A), 88.4% have efr(B), and 88.4% have lsa. Interestingly, in case of different species of Enterococci, eme(A) was also detected in four strains of E. faecium, seven strains of E. avium, four strains of E. durans and two strains of E. raffinosus. efr(A) was also detected in two strains of E. faecium and two strains of E. durans and efr(B) was also detected in four strains of E. faecium, five strains of E. avium and four strains of E. durans. This means the possibility of co-transfer of resistance genes between Enterococci species in natural environment. These results are the first report describing the presence of same multidrug efflux pumps in different species of Enterococci in Korea.
Keywords
Enterococci; antibiotic resistance; bovine milk sample; multidrug efflux pump;
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