Detection of different classes of carbapenemases: Adaptation and assessment of a phenotypic method applied to Enterobacteriaceae, Pseudomonas aeruginosa and Acinetobacter baumannii, and proposal of a new algorithm

作者：Gautier Guillaume; Guillard Thomas; Podac Bianca; Bercot Beatrice; Vernet Garnier Veronique; de Champs Christophe

来源：Journal of Microbiological Methods, 2018, 147: 26-35.

DOI：10.1016/j.mimet.2018.02.013

• Carbapenemases
• Algorithm
• Enterobacteriaceae
• Faropenem
• Temocillin
• OXA-48

A new phenotypic method for detecting carbapenemases has been adapted (assembling of two MAST kits, including one that contains faropenem to which a temocillin disk has been added) then assessed using 101 bacterial strains (Enterobacteriaceae with assays on Pseudomonas aeruginosa and Acinetobacter baumannii) including 62 which produce genetically identified carbapenemases. Concerning Carbapenemase-Producing Enterobacteriaceae (CPE), there is 100% sensitivity for Klebsiella pneumoniae carbapenemase (KPC, Ambler class A) and OXA-48 (Ambler class D), and 91% for metallo-beta-lactamase (MBL, Ambler class B), with a 97% sensitivity for all carbapenemases, with a specificity of 100%. The test is also efficient for detecting Pseudomonas aeruginosa carbapenemases (sensitivity between 82 and 100% and 100% specificity). The major innovation is the combined use of faropenem and temocillin for reliable detection (excellent performance with 100% sensitivity and specificity) of OXA-48. This study has led to the development of a new algorithm to detect the different classes of carbapenemases, for first-line diagnosis, by combining this modified MAST test with immunochromatographic methods and molecular biology techniques.

• 出版日期2018-4