Assessment of Phenotypic Testing by mCIM with eCIM for Determination of the type of Carbapenemase Produced by Carbapenem-resistant Enterobacterales | ||||
Egyptian Journal of Medical Microbiology | ||||
Volume 32, Issue 1, January 2023, Page 37-46 PDF (440.82 K) | ||||
Document Type: New and original researches in the field of Microbiology. | ||||
DOI: 10.21608/ejmm.2023.277771 | ||||
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Authors | ||||
Aliaa Gamaleldin Aboulela ![]() ![]() ![]() ![]() ![]() | ||||
1Medical Research Institute, Alexandria University | ||||
2High Institute of public health, Alexandria University | ||||
3Microbiology department, High Institute of Public Health, Alexandria University, Alexandria, Egypt | ||||
Abstract | ||||
Background: Carbapenemase-producing Enterobacterales are increasingly spreading in healthcare facilities. Identifying the type of carbapenemase can help epidemiologic surveillance and proper selection of antimicrobials. Objective: This study assessed the sensitivity and specificity of carbapenem inactivation method (mCIM with eCIM) for identification of carbapenemase-production. Methodology: The study involved 150 isolates of Enterobacterales. Carbapenem-resistant isolates by Kirby Bauer method were further tested for carbapenemase production phenotypically by mCIM with eCIM, and genotypically by multiplex PCR using specific primers for blaKPC, blaOXA-48, blaNDM-1, blaVIM, and blaIMP. Results: Resistance to carbapenem was observed in 53/150 isolates. Phenotypically, 28/53 isolates produced metallo-β-lactamase, 16/53 produced serine carbapenemase, 5/53 isolates gave inconclusive results, and 4/53 were negative by mCIM with eCIM test. Genotypically, 30 isolates carried blaNDM-1, and 41 isolates carried blaOXA-48. Both genes co-existed in 18 Metallo-β-lactamase producers. The 9 isolates with negative or inconclusive results carried carbapenemase-encoding genes. For mCIM with eCIM test the sensitivity and specificity of detecting Metallo-β-lactamase production were higher (87% and 91%) than for serine carbapenemase detection (34% and 83%), respectively. Conclusion: It was concluded that the mCIM with eCIM test does not always lead to true conclusions about the existence and the type of carbapenemase produced by Enterobacterales. | ||||
Keywords | ||||
Carbapenem-resistant Enterobacterales; mCIM with eCIM; metallo-beta-lactamase detection; serine-carbapenemase detection; blaOXA-48 gene; blaNDM-1 gene | ||||
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