Carba plus纸片法检测肠杆菌科细菌碳青霉烯酶的性能评估

Performance of Carba plus disc method in detection of carbapenemases of Enterobacteriaceae

  • 摘要: 目的 评估Carba plus纸片法检测碳青霉烯酶类型的能力和临床价值。方法 收集陆军军医大学大坪医院2017年1月-2017年12月临床分离的77株耐碳青霉烯类肠杆菌科细菌(carbapenem-resistant Enterobacteriaceae,CRE)为实验组,同时选取84株碳青霉烯敏感肠杆菌科细菌(carbapenem-sensitive Enterobacteriaceae,CSE)作为对照组,所有菌株进行耐药基因检测和Carba plus纸片法检测,以耐药基因检测结果作为碳青霉烯酶类型的金标准,同时对Carba plus纸片法检测碳青霉烯酶类型的相关性能指标进行统计分析。结果 77株CRE中经耐药基因序列分析结果KPC阳性51株,MBL阳性22株,OXA-48阳性4株。Carba plus纸片法检测结果KPC阳性42株,MBL阳性26株,OXA-48阳性5株,其余4株未检测出产酶基因型。Carba plus纸片法预测KPC酶的灵敏度为82.3%,特异度为100.0%,阳性预测值为100.0%,阴性预测值为92.4%,准确度为94.4%;预测MBL酶阳性的灵敏度为100.0%,特异度为97.1%,阳性预测值为84.6%,阴性预测值为100.0%,准确度为97.5%;预测产OXA-48酶的灵敏度为100.0%,特异度为99.4%,阳性预测值为80.0%,阴性预测值为100.0%,准确度为99.4%。结论 Carba plus纸片法对CRE菌株产酶类型可进行快速、准确、便捷地鉴定,在基层微生物实验室有很大的发展前景,可作为表型确认试验和耐药监测的一种主要手段。

     

    Abstract: OBJECTIVE To evaluate the performance and clinical value of Carba plus disc in detection of carbapenemases. METHODS Totally 77 strains of carbapenem-resistant Enterobacteriaceae(CRE) that were isolated from Daping Hospital, Army Medical University from Jan 2017 to Dec 2017 were assigned as the experimental group, meanwhile, 84 strains of carbapenem-sensitive Enterobacteriaceae(CSE) were set as the control group.The drug resistance genes of all the strains were detected, the Carba plus disc detection was performed, the result of detection of the drug resistance genes was set as the gold standards for identification of carbapenemases, and the performance indexes of Carba plus disc method in detection of carbapenemases were statistically analyzed. RESULTS The result of drug resistance gene sequencing analysis of the 77 strains of CRE showed that there were 51 KPC-positive strains, 22 MBL-positive strains and 4 OXA-48-positive strains.The result of Carba plus disc detection indicated that there were 42 KPC-positive strains, 26 MBL-positive strains and 5 OXA-48-positive strains, while, there were 4 strains that were not detected with any enzyme-producing genotype.The sensitivity of the Carba plus disc method was 82.3% in prediction of KPC, the specificity 100.0%, the positive predictive value 100.0%, the negative predictive value 92.4%, the accuracy 94.4%; the sensitivity was 100.0% in prediction of MBL, the specificity 97.1%,the positive predictive value 84.6%,the negative predictive value 100.0%, the accuracy 97.5%; the sensitivity was 100.0% in prediction of OXA-48,the specificity 99.4%, the positive predictive value 80.0%,the negative predictive value 100.0%,the accuracy 99.4%. CONCLUSION Carba plus disc method may contribute to the rapid, accurate and convenient identification of the carbapenemases of the CRE strains, it has a promising future in grass-roots microbiology laboratories and can be used as a major mean for phenotypic confirmation tests and monitoring of drug resistance.

     

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