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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/12043


    Title: Resistance mechanisms and molecular epidemiology of carbapenem-nonsusceptible Escherichia coli in Taiwan, 2012-2015
    Authors: Chang, YT;Siu, LK;Wang, JT;Wu, TL;Chen, YH;Chuang, YC;Lin, JC;Lu, PL
    Contributors: National Institute of Infectious Diseases and Vaccinology
    Abstract: Purpose: This study aimed to investigate the resistance mechanisms and molecular epidemiology of carbapenem-nonsusceptible Escherichia coli (CnsEC) in Taiwan. Patients and methods: From 2012 to 2015, 237 E. coli isolates with minimum inhibitory concentrations of imipenem or meropenem > 1 mu g/mL were collected in a nationwide surveillance and subjected to polymerase chain reaction (PCR) for carbapenemase, AmpC-type beta-lactamase, and extended spectrum beta-lactamase (ESBL) genes. We evaluated outer membrane proteins (OmpF and OmpC) loss and conducted multilocus sequence typing and pulsed-field gel electrophoresis (PFGE). Isolates that were resistant to all carbapenems were designated as pan-carbapenem-resistant E. coli (pCREC) in this study. Results: The predominant resistance mechanism of CnsEC in Taiwan was the CMY-2 beta-lactamase in combination with OmpF and OmpC loss. Sequence type 131 was the most prevalent type (29.2%). Among 237 CnsEC isolates, 106 (44.7%) isolates were pCREC and 18 (7.59%) produced carbapenemase. The prevalence of carbapenemases increased from 6% in 2012 to 11.36% in 2015. Various carbapenemases including KPC-2, IMP-8, NDM-1, NDM-5, VIM-1, OXA-48, and OXA-181 were identified, with NDM-1 being the most common (38.9%) carbapenemase. Comparison between pCREC and non-pCREC among the non-carbapenemase-producing CnsEC isolates revealed SHV, CMY, co-carriage of SHV and CTX-M and concurrent loss of both OmpF and OmpC were more commonly detected in the pCREC group. PFGE revealed no nationwide clonal spread of carbapene-mase-producing E. coli. Conclusion: NDM-1 was the most common carbapenemase and combination of CMY-2 and concurrent OmpF and OmpC porin loss was the most prevalent resistance mechanism in CnsEC in Taiwan.
    Date: 2019-05
    Relation: Infection and Drug Resistance. 2019 May;12:2113-2123.
    Link to: http://dx.doi.org/10.2147/idr.s208231
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1178-6973&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000477624500001
    Cited Times(Scopus): https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85073397018
    Appears in Collections:[蕭樑基] 期刊論文

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