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Journal of Clinical Microbiology, September 2007, p. 2863-2871, Vol. 45, No. 9
0095-1137/07/$08.00+0     doi:10.1128/JCM.00981-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Multicenter Evaluation of the BD Phoenix Automated Microbiology System for Antimicrobial Susceptibility Testing of Streptococcus Species{triangledown}

Sandra S. Richter,1* Wanita J. Howard,1 Melvin P. Weinstein,2 David A. Bruckner,3 Janet F. Hindler,3 Michael Saubolle,4 and Gary V. Doern1

Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, Iowa,1 Robert Wood Johnson Medical School, New Brunswick, New Jersey,2 UCLA Healthcare, Los Angeles, California,3 Lab Science of Arizona, Tempe, Arizona4

Received 10 May 2007/ Returned for modification 13 June 2007/ Accepted 16 July 2007

This multicenter study evaluated the BD Phoenix Automated Microbiology System STREP panel (BD Diagnostic Systems). Antimicrobial susceptibility testing (AST) with 13 agents was performed on 2,013 streptococci (938 Streptococcus pneumoniae isolates; 396 group B streptococci [GBS]; 369 viridans group streptococci [VGS]; 290 beta-hemolytic streptococcus groups A, C, and G; and 20 other streptococci) with the Phoenix system and a broth microdilution reference method. Clinical and challenge isolates were tested against cefepime, cefotaxime (CTX), ceftriaxone (CTR), clindamycin (CLI), erythromycin (ERY), gatifloxacin, levofloxacin, linezolid, meropenem, penicillin (PEN), tetracycline (TET), trimethoprim-sulfamethoxazole, and vancomycin. Clinical isolates with major errors or very major errors (VMEs) were retested in duplicate by both methods. The final results for clinical isolates showed the following trends. For all of the organism-antimicrobial agent combinations tested, categorical agreement (CA) was 92 to 100%, with one exception—VGS-PEN (87% CA; all errors were minor). For S. pneumoniae, there was one major error with CLI (0.1%) and one or two VMEs with CTX (4%), CTR (4.5%), ERY (0.9%), and TET (0.7%). For groups A, C, and G, the CA was 97 to 100% and the only VMEs were resolved by additional reference laboratory testing. For GBS, there was only one VME (TET, 0.3%) and D-zone testing of 23 isolates with CLI major errors (one isolate unavailable) revealed inducible CLI resistance. For VGS, the major error rates were 0 to 3% and VMEs occurred with seven agents (3.5 to 7.1%). The mean times required for organism groups to generate results ranged from 8.4 to 9.4 h. The Phoenix system provided reliable and rapid AST results for most of the organism-antimicrobial agent combinations tested.

* Corresponding author. Mailing address: Department of Pathology, University of Iowa Roy J. and Lucille A. Carver College of Medicine, 200 Hawkins Drive, C606 GH, Iowa City, IA 52242-1009. Phone: (319) 356-2990. Fax: (319) 356-4916. E-mail: sandra-richter{at}uiowa.edu

{triangledown} Published ahead of print on 25 July 2007.

Journal of Clinical Microbiology, September 2007, p. 2863-2871, Vol. 45, No. 9
0095-1137/07/$08.00+0     doi:10.1128/JCM.00981-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Mittman, S. A., Huard, R. C., Della-Latta, P., Whittier, S. (2009). Comparison of BD Phoenix to Vitek 2, MicroScan MICroSTREP, and Etest for Antimicrobial Susceptibility Testing of Streptococcus pneumoniae. J. Clin. Microbiol. 47: 3557-3561 [Abstract] [Full Text]  


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