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Journal of Clinical Microbiology, October 2009, p. 3326-3328, Vol. 47, No. 10
0095-1137/09/$08.00+0     doi:10.1128/JCM.01088-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Impact of a Short Period of Pre-Enrichment on Detection and Bacterial Loads of Methicillin-Resistant Staphylococcus aureus from Screening Specimens{triangledown}

L. Van Heirstraeten,1,3 J. Cortiñas Abrahantes,2 C. Lammens,1,3 A. Lee,4 S. Harbarth,4 G. Molenberghs,2 M. Aerts,2 H. Goossens,1,3 S. Malhotra-Kumar,1,3* on behalf of the MOSAR WP2 Study Group

University of Antwerp, Antwerp, Belgium,1 Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BIOSTAT), Hasselt University, Diepenbeek, Belgium,2 Vaccine and Infectious Disease Institute, Belgium,3 University of Geneva Hospitals and Medical School, Geneva, Switzerland4

Received 4 June 2009/ Returned for modification 15 July 2009/ Accepted 2 August 2009

We compared the impacts of direct plating on a chromogenic medium and of plating after enrichment (4 h and overnight) on the detection of methicillin-resistant Staphylococcus aureus (MRSA) from 52 patient screening samples. MRSA colony counts for {approx}70% of samples after overnight pre-enrichment were >20-fold higher than the counts after the other two treatments. The qualitative differences (sample was MRSA positive/negative) between the results of the direct plating and 4-h pre-enrichment treatments were not significant, indicating no advantage of the latter; however, the number of samples positive for MRSA increased significantly after an overnight sample pre-enrichment (P < 0.005).

* Corresponding author. Mailing address: Department of Medical Microbiology, Campus Drie Eiken, University of Antwerp, S3, Universiteitsplein 1, B-2610 Wilrijk, Belgium. Phone: 32-3-820-25-51. Fax: 32-3-820-26-63. E-mail: surbhi.malhotra{at}ua.ac.be

{triangledown} Published ahead of print on 12 August 2009.

Journal of Clinical Microbiology, October 2009, p. 3326-3328, Vol. 47, No. 10
0095-1137/09/$08.00+0     doi:10.1128/JCM.01088-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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