SUMMARY. A total of 57 strains of was fingerprinted by SDS-PAGE of cellular protein. All strains were also examined by conventional, API and N/F-Tek methods, and antibiotic sensitivity patterns were determined. In general, using the API 20E and N/F-Tek methods, it was possible to assign isolates of to the two accepted “biotypes” or “varieties”, and , but these methods did not offer useful subdivision of the biotypes. Gel electrophoresis permitted subdivision of the strains into clusters in a manner which suggests that the technique may be valuable in typing strains isolated during outbreaks of infection in hospital.


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