Fig. 1.

Characterization of ETEC isolates according to O serogroup and classical and nonclassical virulence genes. All isolates were named, and their serogroup and profiles of virulence genes are shown beside them. A dendrogram showing genetic relationships between strains was built based on MLVA. Genetic distance is shown above the tree. Reference ETEC strains H10407 (O78, STh-STp/CFAI) and E24377A (O139, STh-LT/CS1-CS3) carrying known features were included. Shaded squares show the isolates carrying the most prevalent features. ONT, nontypeable O serogroup; ND, not detected.