Three typing methods commonly used for bacteria - phage typing, antimicrobial susceptibility and pulsed-field gel electrophoresis (PFGE) - were used to characterise 64 serotype Typhimurium isolates from individual adult patients from Nairobi, Kenya. The isolates encompassed 11 definitive phage types (DTs), which fell into eight PFGE clusters; 31.3% of isolates were either untypable or reacted non-specifically with the phages used for typing and 26.6% were of DT 56. Plasmids of . 100 kb were responsible for self-transferable multiresistance among the isolates. Analysis by PFGE and phage type demonstrated that multiresistant Typhimurium strains causing diarrhoea and invasive disease were multiclonal.


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