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Impact of a Short Period of Pre-enrichment on Detection and Bacterial Loads of Methicillin-resistant Staphylococcus Aureus from Screening Specimens

Overview
Journal J Clin Microbiol
Specialty Microbiology
Date 2009 Aug 14
PMID 19675216
Citations 8
Authors
L Van Heirstraeten
J Cortinas Abrahantes
C Lammens
A Lee
S Harbarth
G Molenberghs
M Aerts
H Goossens
S Malhotra-Kumar
Affiliations
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Abstract

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 approximately 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).

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