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Dendrogram and band pattern generated by DiversiLab rep-PCR of Escherichia coli isolated from the study sites. Similarity ≥ 95% indicates clonally related strains. ESBL+ indicates a positive ESBL test by VITEK. “Sewer” designates isolates from raw sewage in Northeast Ohio, “DC” isolates from the urban lake in Brazil, and “Jenipapo” isolates from the rural river in Brazil. ESBL = extended-spectrum β-lactamases.
