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Disk Carbapenemase Test for the Rapid Detection of KPC-, NDM-, and Other Metallo-β-Lactamase-Producing Gram-Negative Bacilli
Annals of Laboratory Medicine ; : 434-440, 2016.
Article in English | WPRIM | ID: wpr-59852
ABSTRACT

BACKGROUND:

Rapid detection of carbapenemase-producing gram-negative bacilli (GNB) is required for optimal treatment of infected patients. We developed and assessed a new disk carbapenemase test (DCT).

METHODS:

Paper disks containing 0.3 mg of imipenem and bromothymol blue indicator were developed, and the performance of the DCT were evaluated by using 742 strains of GNB with or without carbapenemases.

RESULTS:

The paper disks were simple to prepare, and the dried disks were stable at -20℃ and at 4℃. The DCT detected 212 of 215 strains (98.6% sensitivity with 95% confidence interval [CI] 96.0-99.5%) of GNB with known class A (KPC and Sme) and class B (NDM, IMP, VIM, and SIM) carbapenemases within 60 min, but failed to detect GES-5 carbapenemase. The DCT also detected all two Escherichia coli isolates with OXA-48, but failed to detect GNB with OXA-232, and other OXA carbapenemases. The DCT showed 100% specificity (95% CI, 99.2-100%) in the test of 448 imipenem-nonsusceptible, but carbapenemase genes not tested, clinical isolates of GNB.

CONCLUSIONS:

The DCT is simple and can be easily performed, even in small laboratories, for the rapid detection of GNB with KPC, NDM and the majority of IMP, VIM, and SIM carbapenemases.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Paper / Bacterial Proteins / Beta-Lactamases / Bromthymol Blue / Microbial Sensitivity Tests / Imipenem / Drug Resistance, Bacterial / Gram-Negative Bacteria / Anti-Bacterial Agents Type of study: Diagnostic study Language: English Journal: Annals of Laboratory Medicine Year: 2016 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Paper / Bacterial Proteins / Beta-Lactamases / Bromthymol Blue / Microbial Sensitivity Tests / Imipenem / Drug Resistance, Bacterial / Gram-Negative Bacteria / Anti-Bacterial Agents Type of study: Diagnostic study Language: English Journal: Annals of Laboratory Medicine Year: 2016 Type: Article