1887

Abstract

Thirteen restriction endonuclease-containing strains were isolated from a collection of 186 clinical isolates of spp. Among these, eight and five isolates carried isoschizomers of RII and I, respectively. The former restriction-modification (R-M) system was homologous to that of RII and was located on plasmids with sizes of 46.6 or 55.6 kb. Isolates producing I isoschizomers contained a 5.7-kb non-transferable plasmid. Together with antimicrobial susceptibility tests and plasmid profile studies, it is concluded that these two R-M systems are not widely spread but confined to strains with similar antibiotic resistance and plasmid profile.

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1997-11-01
2023-01-29
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