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Journal of Clinical Microbiology, January 2006, p. 241-243, Vol. 44, No. 1
0095-1137/06/$08.00+0     doi:10.1128/JCM.44.1.241-243.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Utility of the VITEK 2 Advanced Expert System for Identification of Extended-Spectrum ß-Lactamase Production in Enterobacter spp.

Division of Epidemiology,¹ Clinical Microbiology Laboratory, Tel Aviv Sourasky Medical Center, 6 Weizmann St., Tel Aviv, Israel²

Received 8 July 2005/ Returned for modification 13 August 2005/ Accepted 6 November 2005

Forty clinical isolates of Enterobacter spp. were identified as extended-spectrum ß-lactamase (ESBL) producers by disk diffusion. The VITEK 2 Advanced Expert System (AES) identified the ESBL phenotype in only 25 isolates (62.5%), and erroneously reported cephalosporin susceptibility in 11 isolates (28%). Refinements in the AES are required in order to improve ESBL detection in Enterobacter.

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