A biochemically typical strain of Citrobacter freundii which carries the Escherichia coli 0157 antigen is described. The significance of differentiating such strains from typical E. coli 0157 strains is stressed. Strains of Escherichia coli serotype 0157:H7 are being isolated with increasing frequency from patients with diarrhea, hemorrhagic colitis, hemolytic-uremic syndrome, or thrombocytopenia purpura (12, 16) and are now accepted as important enteric pathogens. Generally, these strains produce Vero cell cytotoxins, which are also known as Shigalike toxins (SLT), and if motile carry the flagellar antigen H7. Strains of Escherichia hermannii are known to cross react with E. coli 0157 antisera (6). In the course of our investigations on the possible relationship of toxigenic E. coli and sudden infant death syndrome (2, 3), we isolated an E. coli-like organism (strain F90/2460-1) from the intestinal contents of a female infant, aged 2.5 months, who died of sudden infant death syndrome. Strain F90/2460-1 behaved * Corresponding author.
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