Misidentification of Listeria monocytogenes by the Vitek 2 system.

J Clin Microbiol

National Salmonella, Shigella & Listeria Reference Laboratory, Medical Microbiology Department, University Hospital Galway, Galway, Ireland.

Published: September 2014

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4313182PMC
http://dx.doi.org/10.1128/JCM.01725-14DOI Listing

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Listeria monocytogenes is a facultative anaerobic intracellular Gram positive rod causing infection in pregnant women, extremes of age and immune-compromised hosts. In clinical specimens, the organisms may be gram-variable: laboratory misidentification of L. monocytogenes isolates as diphtheroids, streptococci, or enterococci is not uncommon and the isolation of a diphtheroid from blood or CSF should always alert the clinician to the possibility that the organism may be L.

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Misidentification of Listeria monocytogenes by the Vitek 2 system.

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A collaborative study was conducted to evaluate the performance of the VITEK 2 Gram Positive (GP) identification card for use with the VITEK 2 automated microbial identification system. The GP test card is used in the identification of selected Gram positive organisms, including Listeria and Staphylococcus species. The VITEK 2 GP card is based on 43 biochemical tests measuring carbon source utilization, inhibition and resistance, and enzymatic activities.

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