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Phylogenetic tree of erythromycin-resistant enterococci from swine. DNA for PFGE was digested with SmaI. Farm, species, and source for each isolate are shown. One cluster of >75% similarity and six clusters of ≥80% similarity were identified. Levels of similarity were determined by using Dice coefficient and the unweighted pair group method. Asterisks indicate isolates that contain ermB-positive plasmids.
