Shiga toxin-producing Escherichia coli strains of serogroup O111 are the most frequently isolated non-O157 strains causing outbreaks of gastroenteritis with haemolytic uraemic syndrome (HUS). O antigen is a major antigen in Gram-negative bacteria, and it has been shown that O111 is a protective antigen. Attenuated Salmonella enterica sv Typhimurium aroA strain STM-1 was used as a live carrier t...
