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Braz. j. microbiol ; 47(3): 691-696, July-Sept. 2016. tab
Article Dans Anglais | LILACS | ID: lil-788958

Résumé

ABSTRACT This study highlights the prevalence of aminoglycoside-modifying enzyme genes and virulence determinants among clinical enterococci with high-level aminoglycoside resistance in Inner Mongolia, China. Screening for high-level aminoglycoside resistance against 117 enterococcal clinical isolates was performed using the agar-screening method. Out of the 117 enterococcal isolates, 46 were selected for further detection and determination of the distribution of aminoglycoside-modifying enzyme-encoding genes and virulence determinants using polymerase chain reaction -based methods. Enterococcus faecium and Enterococcus faecalis were identified as the species of greatest clinical importance. The aac(6')-Ie-aph(2")-Ia and ant(6')-Ia genes were found to be the most common aminoglycoside-modifying enzyme genes among high-level gentamicin resistance and high-level streptomycin resistance isolates, respectively. Moreover, gelE was the most common virulence gene among high-level aminoglycoside resistance isolates. Compared to Enterococcus faecium, Enterococcus faecalis harbored multiple virulence determinants. The results further indicated no correlation between aminoglycoside-modifying enzyme gene profiles and the distribution of virulence genes among the enterococcal isolates with high-level gentamicin resistance or high-level streptomycin resistance evaluated in our study.


Sujets)
Mâle , Femelle , Régulation de l'expression des gènes bactériens/effets des médicaments et des substances chimiques , Régulation de l'expression des gènes codant pour des enzymes/effets des médicaments et des substances chimiques , Enterococcus/effets des médicaments et des substances chimiques , Enterococcus/physiologie , Résistance bactérienne aux médicaments , Aminosides/métabolisme , Aminosides/pharmacologie , Virulence/génétique , Tests de sensibilité microbienne , Chine/épidémiologie , Prévalence , Infections bactériennes à Gram positif/microbiologie , Infections bactériennes à Gram positif/épidémiologie , Enterococcus/métabolisme , Gènes bactériens , Antibactériens/métabolisme
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