Laboratory Medicine ›› 2022, Vol. 37 ›› Issue (1): 68-71.DOI: 10.3969/j.issn.1673-8640.2022.01.014

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Evaluation of colloidal gold immunochromatography assay for the rapid determination of carbapenemase in CRE isolates

YAO Lifeng, ZHENG Qiaoping, YANG Meng, LUO Qingqiong, CHEN Xu(), CHEN Fuxiang()   

  1. Department of Clinical Laboratory,Shanghai Ninth People's Hospital,Shanghai Jiao Tong University School of Medicine,Shanghai 200011,China
  • Received:2021-06-10 Revised:2021-08-06 Online:2022-01-30 Published:2022-03-07
  • Contact: CHEN Xu,CHEN Fuxiang

Abstract:

Objective To evaluate the clinical application role of colloidal gold immunochromatography assay(GICA) for the rapid determination of carbapenemase in carbapenem-resistant Enterobacteriaceae(CRE) isolates. Methods Totally,73 non-reduplicative isolates of CRE were isolated. The expression of carbapenemase gene was identified by polymerase chain reaction(PCR),and the rapid determination of carbapenemase was performed by GICA. PCR was used as reference method to evaluate the accuracy of GICA in the rapid determination of carbapenemase. Results The results of PCR for the 73 CRE isolates showed that there were 51 blaKPC positive isolates(69.9%),19 blaNDM positive isolates(26.0%),2 blaIMP positive isolates(2.7%) and 1 blaVIM positive isolate(1.4%) with no blaOXA positive isolate determined. The accuracy of GICA for the determination of the carbapenemase types of blaKPC,blaNDM,blaIMP and blaVIM positive isolates was 100%. The consistency of GICA and PCR in the determination of carbapenemase types of CRE isolates is 100%. Conclusions GICA with the characteristics of simple,rapid and high accuracy has a potential clinical application role in early monitoring of carbapenem-resistant isolates and providing a reference for anti-infection therapy.

Key words: Carbapenem-resistant Enterobacteriaceae, Carbapenemase, Colloidal gold immunochromatography assay, Polymerase chain reaction, Rapid determination

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