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© Research
Publication : Diagnostic microbiology and infectious disease

Performance of distinct phenotypic methods for carbapenemase detection: The influence of culture media.

Member: Carolina Nodari
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Diagnostic microbiology and infectious disease - 01 Jan 2020

Cordeiro-Moura JR, Fehlberg LCC, Nodari CS, Matos AP, Alves VO, Cayô R, Gales AC,

Link to Pubmed [PMID] – 31704067

Link to DOI – S0732-8893(19)30812-010.1016/j.diagmicrobio.2019.114912

Diagn Microbiol Infect Dis 2020 Jan; 96(1): 114912

We evaluated the performance of five phenotypic tests [Modified Hodge Test (MHT); combined-disk test (CDT) using phenylboronic acid, EDTA, and cloxacillin; CarbaNP and CarbAcinetoNP; Blue-Carba, Carbapenembac™ and Carbapenembac Metallo™] for carbapenemase detection in Gram-negative bacilli (GNB). A total of 73 carbapenemase producers and 27 non-carbapenemase producers were tested. All GNB were subcultured onto Müeller-Hinton agar (MHA), MacConkey agar (MAC), and sheep blood agar (SBA). High sensitivity (100%) and specificity (100%) was observed for MHA using CarbaNP, Blue-Carba, and Carbapenembac™. The sensitivity and specificity of CarbaNP (98.6%/100%), Blue-Carba (97.1%/91.0%), and Carbapenembac™ (100%/96.5%) were slightly lower for SBA. In contrast, unacceptable sensitivity rates of CarbaNP (71.1%) and Blue-Carba (66.6%), but not Carbapenembac™ (97.3%), were observed for MAC. The colorimetric methods showed high sensitivity and specificity to detect carbapenemase production from isolates grown on MHA or SBA. However, colonies obtained from MAC must not be tested for carbapenemase detection by colorimetric methods.