Abstract
In most countries Escherichia coli of serogroups O145 and O63 are associated with Shiga toxin-producing Escherichia coli (STEC). STEC strains belonging to these serogroups harbor beyond stx genes for Shiga toxins (Stx) production, the eae gene, a virulence marker defining Enteropathogenic E. coli pathotype (EPEC). In Brazil O145 and O63 E. coli strains are often recovered from cases of hu…