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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.
Mitchell J. Schwaber,1*
Shiri Navon-Venezia,1
Inna Chmelnitsky,1
Azita Leavitt,1
David Schwartz,2 and
Yehuda Carmeli1
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.
* Corresponding author. Mailing address: Division of Epidemiology, Tel Aviv Sourasky Medical Center, 6 Weizmann St., Tel Aviv 64239, Israel. Phone: 972-52-426-6800. Fax: 972-3-697-3256. E-mail:
mitchells{at}tasmc.health.gov.il.
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.
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