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題 名 | Heterogeneity of Resistance Elements in Clinical Isolates of Enterococci with High-Level Gentamicin Resistance=對Gentamicin具高抗藥性腸球菌之抗藥基因分析 |
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作 者 | 鄧麗珍; 廖淑貞; 薛博仁; 何憲武; 陸坤泰; | 書刊名 | 臺灣醫學會雜誌 |
卷 期 | 97:12 1998.12[民87.12] |
頁 次 | 頁855-859 |
分類號 | 414.83 |
關鍵詞 | 高抗藥性; 腸球菌; 抗藥基因; Enterococci; High-level gentamicin resistance; |
語 文 | 英文(English) |
英文摘要 | High-level resistance (minimum inhibitory concentration, MIC> 1,000 μg/ml) to gentamicin (HLGR) in enterococci is common in Taiwan. In this study, we investigated the distribution of gentamicin resistance elements in enterococci isolated at National Taiwan University Hospital in a 1-year period, and also examined the transfer and the genetic variability of the resistance elements of different isolates. Among 109 isolates tested, 43 (39%) HLGR isolates were identified. HLGR was most common in Enterococcus faecium isolates (7/15, 47%), followed by Enterococcus faecalis (34/80, 43%) Enterococcus avium (1/5, 20%), and Enterococcus casseliflavus (1/9,11%). To understand the mechanism of resistance transfer, four isolates of E. faecalis and five isolates of E. faecium showing HLGR were studied. Transfer of resistance markers to a plasmid-free recipient strain of E. faecalis JH2-7 was observed, with transfer frequencies ranging from 10□ 10□. All of the transconjugants contained plasmids, with sizes ranging from 45 kb to larger than 70 kb. At least three plasmid patterns were observed on digestion with HaeIII. Hybridization with a probe specific for the acc6'aph2'' gentamicin resistance gene confirmed that all of these HLGR isolates carried a Gm□ determinant, though the hybridization patterns of the plasmids from E. faecalis and E. faecium were different, Although many similarities exist among enterococcal Gm□ determinants, the results suggest heterogeneity may occur in the flanking regions of resistance elements. |
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