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. 1997 Jun;35(6):1415–1423. doi: 10.1128/jcm.35.6.1415-1423.1997

Contribution of a typing method based on IS256 probing of SmaI-digested cellular DNA to discrimination of European phage type 77 methicillin-resistant Staphylococcus aureus strains.

A Morvan 1, S Aubert 1, C Godard 1, N El Solh 1
PMCID: PMC229760  PMID: 9163455

Abstract

The incidence of infections with phage type 77 methicillin-resistant Staphylococcus aureus (MRSA) strains increased in France in 1987. These strains are widespread in numerous European hospitals. The SmaI restriction profiles of total DNA extracted from 74 phage type 77 MRSA strains isolated from 1987 to 1994 in 10 hospitals in eight European cities (in France, Belgium, and Spain) were analyzed. Hybridization with a probe containing a 468-bp DNA fragment from within the transposase gene of the insertion sequence IS256 was also examined. Forty-three SmaI profiles were detected. Twenty major genotypes were identified, and each genotype contained strains with the same profile or profiles which differed by no more than three bands. Strains isolated in different countries and at several-year intervals were often grouped within the same genotype. A larger number of genotypes could be discriminated by analysis of the patterns of hybridization with the IS256 probe. SmaI restriction fragments with the same apparent electrophoretic mobility could, in some cases, be distinguished by the presence or the absence of nucleotide sequences hybridizing with IS256. The strains that grouped within the same genotype after hybridization with IS256 were mostly those isolated in the same hospital and at less than 12-month intervals. Consequently, the IS256 probe that we used improved restriction profile analysis for discrimination between the intrahospital, outbreak-related phage type 77 MRSA strains and the endemic strains disseminated in various cities and countries.

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Selected References

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