Outbreak of nosocomial infections with two different MRSA-strains involved: significance of genomic DNA fragment patterns in strains otherwise difficult to type

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Abstract
Summary: Methicillin-resistantStaphylococcus aureusisolates from an outbreak of 17 cases of wound infection in a municipal hospital were typed by conventional methods, phage typing by three sets of phages, reverse phage typing and plasmid profiles, as well as by genomic DNA fragment patterns obtained afterSma-I digestion and pulsed-field electrophoresis. These isolates were non-typable by phages, only some were typable by reverse phage typing and were not uniform in plasmid profile. Only the genomic DNA fragment patterns resulted in a clear discrimination of 2 strains (12 isolates for the first and 7 isolates for the second). Both strains were disseminated in different wards of the same hospital and one strain had obviously spread to another clinic in the same city.

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