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Dendrogram of ERIC-PCR patterns of E. coli strains of serotype O51:H40 carrying eae. The analysis of similarity of the normalized images was accomplished using the unweighted-pair group method with arithmetic mean with the Dice optimized coefficient. Control strains were EPEC prototype strain E2348/69 and EHEC prototype strain EDL 933 (serotype O157:H7). Two different ERIC patterns (EI and EII) were found among the O51:H40 strains showing a similarity index of 87%.
