Expression of Shiga toxin 2 (Stx2) in highly virulent Stx-producing Escherichia coli (STEC) carrying different anti-terminator (q) genes

No association between specific q genes and Stx2 mRNA expression level was revealed in stx2a-positive HAS STEC. Our results suggest that other factor(s) than specific q genes might influence the level of Stx2 produced in highly virulent STEC.