Evaluation of NG-Test CARBA 5 for the detection of carbapenemase-producing Gram-negative bacilli
JOURNAL OF MEDICAL MICROBIOLOGY(2022)
Abstract
Introduction. Carbapenemase-producing Enterobacterales (CPE) pose one of the most serious antimicrobial resistance threats to public health worldwide. The outcome of CPE infection differs depending on the resistance mechanism. Therefore, rapid detection of CPE infection is essential for optimizing patient management. The carbapenem inactivation method (CIM) and modified CIM (mCIM) are standard methods for detecting CPE, but they usually require 24 h to generate results. Hypothesis/Gap Statement. Recently, an immunochromatographic assay, NG-Test CARBA 5. has become commercially available. It detects the five most common carbapenemase producers (KPC, IMP, NOM. VIM, and OXA-48) rapidly and accurately. Aim. We aimed to evaluate the diagnostic accuracy of NG-Test CARBA 5 for detecting carbapenemase-producing Gram-negative bacilli (CPGNB). Methodology. We used 116 carbapenemase-producing strains and 48 non-carbapenemase-producing strains. Of the 116 carbapenemase-producing strains, 107 harboured genes for at least one of the five most common carbapenemases, KPC, IMP, NDM, VIM, and OXA-48-like. Forty-eight non-carbapenemase-producing strains, including carbapenem-resistant Enterobacterates, harboured genes for extended-spectrum beta-lactamases (CTX-M groups [n=25] and SHV groups En=21) or plasmid-mediated AmpC beta-lactamases (DHA [n=3], CMY-2 [n=2], and CFE-1 [n=1]). Antimicrobial susceptibility was tested using the agar dilution method, according to the Clinical and Laboratory Standards Institute guidelines. Results. Of the 116 carbapenemase-producing strains. 79 were resistant to at least meropenem or imipenem. The sensitivity and specificity of the NG-Test CARBA 5 for the strains were 99.1 % (106 strains positive for 107 strains of the five most common carbapenemase producers) and 100% (60 strains negative for other types of CPGNB [n=10] and non-CPGNB strains [n=48]), respectively. The carbapenemase-producing strain with a false-negative result produced IMP-66. Conclusion. The NG-Test CARBA 5 had high sensitivity and specificity for detecting carbapenemase-producing strains.
MoreTranslated text
Key words
carbapenemase, carbapenemase producing Enterobacterales, antimicrobial resistance, immunochromatography, diagnostic accuracy, Gram-negative bacilli
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined