Prospective evaluation of the OKN K-SeT assay, a new multiplex immunochromatographic test for the rapid detection of OXA-48-like, KPC and NDM carbapenemases.

ABSTRACT:

Objectives

There is an urgent need for accurate and fast diagnostic tests capable of identifying carbapenemase producers. Here, we assessed the performance of a new multiplex lateral flow assay (OKN K -SeT) for the rapid detection of OXA-48-like, KPC and NDM carbapenemase-producing Enterobacteriaceae from culture colonies.

Methods

Two hundred collection isolates with characterized ?-lactamase content and 183 non-duplicate consecutive isolates referred to two National Reference Centres over a 2?month period in 2016 were used to evaluate the OKN K -SeT assay.

Results

The assay correctly detected all 42 OXA-48-like-, 27 KPC- and 30 NDM-producing isolates from the collection panel, including 7 isolates that co-produced NDM and OXA-181 carbapenemases. No cross-reactivity was observed with non-targeted carbapenemases ( n? = ? 41) or with non-carbapenemase producers ( n? = ? 60). Prospectively, all OXA-48-like ( n? = ? 69), KPC ( n? = ? 9) and NDM ( n? = ? 19) carbapenemase-producing Enterobacteriaceae isolates were correctly detected, while 11 carbapenemase producers not targeted by the assay went undetected [VIM ( n? = ? 8) and OXA-23/OXA-58-like ( n? = ? 3)]. Overall, the sensitivity and specificity of the assay were 100%.

Conclusions

The OKN assay is efficient, rapid and easy to implement in the workflow of a clinical microbiology laboratory for the confirmation of OXA-48, NDM and KPC carbapenemases. This test represents a powerful diagnostic tool as it enables the rapid detection of the most clinically important carbapenemases without the need for more costly and less frequently available molecular assays.

SUBMITTER: Glupczynski Y 

PROVIDER: S-EPMC5890672 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature