[Genotypes of aminoglycoside-modifying enzyme and clinical study of high-level gentamycin resistant enterococcus].
To determine the antibiotics resistance, aminoglycoside-modifying enzymes and homology of high-level gentamycin resistant enterococcus in clinical specimens.



The high-level gentamicin resistant (HLGR) isolates were screened by the agar method and the resistance of 14 antimicrobial agents was determined by K-B method. The aminoglycoside-modifying enzyme genes were detected by polymerase chain reaction (PCR). Pulsed-field gel electrophoresis (PFGE) was used to analyze the homology of HLGR isolates.



The ratio of HLGR was 64.2% (68/106). Among the HLGR,there were no isolates resistant to linezolid, vancomycin and tecoplanin, and Enterococcus faecium was more resistant to beta-lactam antibiotics and quinolone than Enterococcus faecalis. The positive rate of aac(6')-Ie-aph(2')-Ia was 92.6% and 3 isolates had the resistance gene mostly similar to aph(2')-Id. And among 51 HLGR isolates from the hospitalized patients, PFGE grouped 17 E. faecalis isolates into 4 clusters (A-D), and 33 E. faecium isolates into 8 clusters (A-H) with A cluster as predominant.



HLGR has become the important antibiotic resistance bacteria which results in nosocomial infection; and aac(6')-Ie-aph(2')-Ia is the main aminoglycoside-modifying enzyme gene which causes HLGR.
Qu
Ting-ting
TT
Department of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.
Zhang
Ying
Y
Yu
Yun-song
YS
Chen
Ya-gang
YG
Wei
Ze-qing
ZQ
Li
Lan-juan
LJ
D024881:Drug Resistance, Bacterial / Q000235:genetics*; D016521:Electrophoresis, Gel, Pulsed-Field; D016983:Enterococcus / Q000187:drug effects* / Q000235:genetics; D013293:Enterococcus faecalis / Q000187:drug effects / Q000235:genetics; D016984:Enterococcus faecium / Q000187:drug effects / Q000235:genetics; D005839:Gentamicins / Q000494:pharmacology*; D006801:Humans; D019868:Kanamycin Kinase / Q000235:genetics; D008826:Microbial Sensitivity Tests
D005839:Gentamicins; D019868:Kanamycin Kinase