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Journal of Clinical Microbiology, January 2001, p. 53-56, Vol. 39, No. 1
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.1.53-56.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Comparison of the Vitek Gram-Positive Susceptibility 106 Card and the MRSA-Screen Latex Agglutination Test for Determining Oxacillin Resistance in Clinical Bloodstream Isolates of Staphylococcus aureus

T. Yamazumi,dagger S. A. Marshall, W. W. Wilke, D. J. Diekema, M. A. Pfaller, and Ronald N. Jones*

Medical Microbiology Division, Department of Pathology, University of Iowa College of Medicine, Iowa City, Iowa 52242

Received 21 August 2000/Returned for modification 10 October 2000/Accepted 18 October 2000

The Vitek automated susceptibility testing system with a modified Gram-Positive Susceptibility (GPS) 106 Card (bioMerieux Vitek, Inc., Hazelwood, Mo.) and a rapid slide latex agglutination test (MRSA-Screen; Denka Seiken Co., Ltd., Tokyo, Japan) were evaluated for their ability to detect oxacillin resistance in Staphylococcus aureus. The oxacillin-salt agar screen (OS) test, the reference broth microdilution method, and the detection of the mecA gene by PCR were compared with the commercial products. A total of 200 contemporary (1999) bloodstream infection isolates were collected from the SENTRY Antimicrobial Surveillance Program, representing diverse geographic areas throughout the world. Among the 99 mecA-positive isolates, 3 isolates were found negative by the MRSA-Screen. Another two isolates did not grow on OS plates and had MICs of 0.5 and 2 µg/ml with the Vitek GPS card. All 101 mecA-negative isolates were also found negative by the MRSA-Screen and were categorized as susceptible by the GPS card. Overall, the MRSA-Screen, GPS card, and OS test had sensitivities of 96.9, 98.0, and 98.0% and specificities of 100.0, 100.0, and 98.0%, respectively. MRSA-Screen was a rapid (<= 15 min) and simple test to perform, and the GPS card provided results in <8 h. Both methods were sensitive and specific for detecting staphylococcal oxacillin resistance in the clinical microbiology laboratory.

* Corresponding author. Present address: 345 Beaver Kreek Centre, Suite A, North Liberty, IA 52317. Phone: (319) 665-3370. Fax: (319) 665-3371.

dagger Present address: Department of Clinical Pathology, Kinki University School of Medicine, Ohnohigashi, Osakasayama, Osaka, Japan 589-8511.

Journal of Clinical Microbiology, January 2001, p. 53-56, Vol. 39, No. 1
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.1.53-56.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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