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Characterization of unrelated strains of Staphylococcus schleiferi by using ribosomal DNA fingerprinting, DNA restriction patterns, and plasmid profiles.

Laboratoire de Bactériologie-Virologie, Faculté de Médecine J. Lisfranc, Saint-Etienne, France.

ABSTRACT

The molecular characteristics of 31 unrelated strains of Staphylococcus schleiferi isolated from 13 hospitals between 1973 and 1991 were determined by ribosomal DNA fingerprinting by using a digoxigenin-labeled DNA probe, genomic DNA restriction patterns, and plasmid profiles. Only six strains harbored one or two plasmids. DNA restriction analysis, which was carried out with five endonucleases (EcoRI, HindIII, PstI, PvuII, and ClaI), did not allow us to discriminate between isolates. Ribotyping with HindIII, ClaI, or EcoRI enzymes generated six, seven, and nine distinct patterns, respectively. With the combination ClaI-EcoRI, 13 ribotypes were obtained among the 31 strains, suggesting a relative heterogeneity within the species. Moreover, all strains shared two or three common bands, according to the endonuclease used, which were relatively specific for S. schleiferi in comparison with the ribosomal banding patterns described for other coagulase-negative staphylococci. These results illustrate that ribotyping can be used for the epidemiological investigation of S. schleiferi isolates and possibly for taxonomic analysis in this species.

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