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To assess the prevalence of cytolethal distending toxin (CDT) among Shiga toxin-producing Escherichia coli (STEC), 202 STEC strains were investigated using PCRs targeting various cdt alleles (cdt-I to cdt-V). Seven of the 202 strains contained cdt-III and an additional seven contained cdt-V. All 14 cdt-positive strains produced biologically active CDT, as demonstrated by a progressive distension of cultured Chinese hamster ovary cells. The CDT-positive STEC belonged to eight different serotypes, including sorbitol-fermenting O157 : NM (non-motile). The data demonstrate that CDT is present in some STEC serotypes only. However, more studies are required to evaluate whether CDT presence is associated with severe disease.

Cytolethal distending toxins in Shiga toxin-producing Escherichia coli: alleles, serotype distribution and biological effects