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. 1997 Oct;35(10):2580–2587. doi: 10.1128/jcm.35.10.2580-2587.1997

Typing of Staphylococcus aureus and Staphylococcus epidermidis strains by PCR analysis of inter-IS256 spacer length polymorphisms.

A Deplano 1, M Vaneechoutte 1, G Verschraegen 1, M J Struelens 1
PMCID: PMC230014  PMID: 9316911

Abstract

IS256 elements are present in multiple copies in the staphylococcal genome, either flanking the transposon Tn4001 or independent of it. PCR-based analysis of inter-IS256 spacer polymorphisms was developed for typing of methicillin-resistant Staphylococcus aureus (MRSA) and Staphylococcus epidermidis strains. Using SmaI macrorestriction analysis resolved by pulsed-field gel electrophoresis (PFGE) as the reference method for MRSA typing, excellent reproducibility (100%), discriminatory power (97%), and in vivo stability were observed. Good concordance of the results with those of other molecular typing methods was found for two MRSA collections. Inter-IS256 PCR analysis of a U.S. collection of MRSA strains (n = 36), previously characterized by 15 typing methods, showed more limited discrimination. Agreement was 78% with PFGE analysis and 83% with ribotyping (HindIII). Analysis of a second set of Belgian MRSA strains (n = 17), categorized into two widespread epidemic clones by PFGE analysis, showed 65% agreement. For typing of S. epidermidis strains (n = 26), inter-IS256 PCR showed complete typeability (100%) and good discriminatory power (85%). Inter-IS256 PCR analysis is proposed as an efficient molecular typing assay for epidemiological studies of MRSA or S. epidermidis isolates.

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Selected References

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