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Journal of Clinical Microbiology, August 2001, p. 2964-2966, Vol. 39, No. 8
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.8.2964-2966.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Evaluation of VITEK 2 Rapid Identification and Susceptibility Testing System against Gram-Negative Clinical Isolates

Thomas K. W. Ling,* P. C. Tam, Z. K. Liu, and Augustine F. B. Cheng

Department of Microbiology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, SAR, People's Republic of China

Received 9 April 2001/Returned for modification 8 May 2001/Accepted 18 May 2001

A total of 281 strains of miscellaneous members of the family Enterobacteriaceae, Pseudomonas aeruginosa, and other gram-negative bacteria were evaluated by use of identification tests with the VITEK 2 system (bioMérieux) and an API identification system (bioMérieux). A total of 237 (95%) strains were correctly identified to the species level. Only six (2.1%) strains were misidentified, and eight (2.8%) strains were not identified. Among 14 strains with discrepant identifications, 8 (57.1%) strains were nonfermenters. The susceptibilities of 228 strains to 11 antibiotics including amikacin, netilmicin, tobramycin, gentamicin, ciprofloxacin, imipenem, meropenem, ceftazidime, cefepime, piperacillin, and piperacillin in combination with tazobactam were tested with the VITEK 2 AST-No. 12 card and by the broth microdilution (MB) method, according to NCCLS guidelines, as a reference. For the 2,508 organism-antibiotic combinations, the rates at which duplicate MICs correlated within ±1 dilution ranged from 84.2 to 95.6%. Only 13 (0.5%) and 10 (0.4%) of the susceptibility tests gave major errors (resistant with the VITEK 2 system but sensitive by the MB method) and very major errors (sensitive with the VITEK 2 system but resistant by the MB method), respectively. Both VITEK 2 ID-GNB (an identification system) and VITEK 2 AST-No. 12 (a susceptibility testing system) card systems gave rapid, reliable, and highly reproducible results.

* Corresponding author. Mailing address: Department of Microbiology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, SAR, People's Republic of China. Phone: 852-26322307. Fax: 852-26451256. E-mail: lingt{at}cuhk.edu.hk.

Journal of Clinical Microbiology, August 2001, p. 2964-2966, Vol. 39, No. 8
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.8.2964-2966.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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