Distribution of <i>stx1</i>, <i>stx2</i> and their subtypes in 95 Norwegian non-O157 LEE positive and LEE negative STEC strains.

1STEC-LST: STEC that has lost Shiga toxin. 2Six of these strains, which were stx2 negative E. coli when initially tested at the Norwegian Public Health Institute, had been isolated from a patient with HUS or had a MLVA profile identical to an outbreak STEC strain and was epidemiologically related to that HUS case. The last strain had been stx2 positive when initially tested, but had lost the stx-gene at a later stage. 3When initially tested, three of these strains contained stx1 and one strain contained stx2. Distribution of stx1, stx2 and their subtypes in 95 Norwegian non-O157 LEE positive and LEE negative STEC strains.