Characterization of NDM-5-positive extensively resistant Escherichia coli isolates from dairy cows

文献类型： 外文期刊

第一作者： He, Tao

作者： He, Tao;Wei, Ruicheng;Zhang, Lili;Sun, Lichang;Pang, Maoda;Wang, Ran;Wang, Yang

作者机构：

关键词： blallorws;mcr-1;Dairy cows;Fitness cost;Plasmid stability

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.293； 五年影响因子：3.599 ）

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收录情况： SCI

摘要： The aim of this study was to investigate the prevalence of bla(NDm-5) gene in Escherichia coli isolates from dairy cows and to characterize the molecular traits of the bla(NDm-5)-positive isolates. A total of 169 cows were sampled (169 feces and 169 raw milk samples) in three dairy farms in Jiangsu Province and 203 E. coli isolates were recovered. Among these strains, three isolates carried bla(NDm-5) gene, including one co-harboring mcr-1, which belonged to sequence type 446 and the other two belonged to ST2. Susceptibility testing revealed that the three bla(NDm-5)-positive isolates showed extensive resistance to antimicrobials. The bla(NDm-5) gene was located on a similar to 46-kb IncX3 transferrable pNDM-MGR194-like plasmid in all three isolates, while mcr-1 was located on a similar to 260-kb IncHI2 plasmid pXGElmcr. Competition experiments revealed that acquisition of bla(NDm-5) or mcr-1-bearing plasmid can incur fitness cost of bacterial host, however, plasmid stability testing showed that both bla(NDM-5) and mcr-1-carrying plasmid maintained stable in the hosts after ten passages without antimicrobial selection. Whole genome sequencing revealed that the mcr-1 gene coexisted with multiple resistance genes in pXGElmcr and the backbone of this plasmid was similar to that of previously reported mcr-1-positive plasmid pHNSHP45-2. Moreover, pXGElmcr could be conjugated into clinical NDM-5-positive E. coil isolates in vitro, thereby generating strains that approached pan-resistance. Active surveillance efforts are imperative to monitor the prevalence of bla(NDm-5) and mcr-1 in carbapenem-resistant Enterobacteriaceae from dairy farms throughout China.

分类号： S8

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