FIG. 1.

Dendrogram analysis of Chilean O157 EHEC strains isolated from food products, animal reservoirs, children with HUS, and healthy controls. The tree was constructed applying the unweighted pair-group method with arithmetic means to a matrix resulting from comparison of XbaI PFGE patterns. A, B, and C are genetically related clusters of strains. HUS1 to HUS7, EHEC isolates from HUS patients; C1 to C12, EHEC isolates from asymptomatic patients; P1 to P11, EHEC isolates from pigs; B1 to B3, EHEC isolates from bovines; F1 to F6, EHEC isolates from food products.