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Open Access Short Report

Detection of novel chromosome-SCCmec variants in Methicillin Resistant Staphylococcus aureus and their inclusion in PCR based screening

Anneke van der Zee1*, Lieuwe Roorda1, Willem DH Hendriks1, Jacobus M Ossewaarde12 and Johannes Buitenwerf1

Author Affiliations

1 Maasstad Laboratory, Molecular Diagnostics Unit, Maasstad Hospital, Olympiaweg 350, 3870HT Rotterdam, The Netherlands

2 Erasmus Medical Centre, Rotterdam, The Netherlands

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BMC Research Notes 2011, 4:150  doi:10.1186/1756-0500-4-150

Published: 26 May 2011

Abstract

Findings

To facilitate automation, a novel DNA extraction method for MRSA was adopted. The MRSA specific chromosome-SCCmec PCR was adapted, additional primers were added, and the performance was validated. From various laboratories in The Netherlands we received a total of 86 MRSA clinical isolates, that were negative in commercially available tests. We identified 14 MRSA strains with new variant chromosome-SCCmec junctions by sequence analysis. These MRSA strains appeared to carry SCCmec sequences with a high degree of homology to SCC regions of S. epidermidis and S. haemolyticus. All were included for detection in chromosome-SCCmec based PCR.

Background

Efficient management of Methicillin Resistant Staphylococcus aureus (MRSA) in the hospital is needed to prevent dissemination. It is important that MRSA can be rapidly identified, and effective infection control measures can be initiated. Equally important is a rapid MRSA negative report, especially for patients in isolation. For negative screening we implemented fully automated high through-put molecular screening for MRSA.

Conclusions

Fourteen variant chromosome-SCCmec junctions in MRSA, that are not detected in commercially available MRSA detection kits were added to our PCR to detect all currently known variant SCC-mec types of MRSA.