Survey of purported virulence factors ofEscherichia coli isolated from blood, urine and stool

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One hundred randomly selected urinary and blood isolates and 50 stool isolates ofEscherichia coli were analyzed for phenotypic characteristics which may contribute to their virulence potential. Bacteremic isolates were more likely to have K1 capsules and express mannose-sensitive hemagglutination compared to stool isolates. Blood-stream isolates more frequently contained complete 0 side-chains in their lipopolysaccharide layer and less frequently exhibited mannose-resistant hemagglutination when compared to urinary isolates. Total plasmid content, hemolysin, total colicin and colicin V production were not significantly increased inEscherichia coli from blood or urine when compared to those recovered from stool.