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Journal of Clinical Microbiology, March 2005, p. 1448-1450, Vol. 43, No. 3
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.3.1448-1450.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Erroneous Reporting of Coagulase-Negative Staphylococci as Kocuria spp. by the Vitek 2 System

Infectious Diseases Unit,¹ Laboratories of Molecular Epidemiology,² Microbiology,³ Department of Epidemiology, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel⁴

Received 19 February 2004/ Returned for modification 4 June 2004/ Accepted 18 October 2004

Misidentification of coagulase-negative staphylococci (CoNS) may delay appropriate treatment. We investigated 20 clinical isolates identified as Kocuria spp. by the Vitek 2 system. All were identified as CoNS by 16S rRNA gene sequencing (18 Staphylococcus epidermidis, 1 Staphylococcus haemolyticus). Four Kocuria isolates were shown to be identical to CoNS from the same patient by pulsed-field gel electrophoresis. Isolates identified by Vitek 2 as Kocuria most likely represent misidentified CoNS, and if clinically indicated, should be investigated further by genomic methods.

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