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Dendrogram produced by cluster analysis of the ERIC-PCR fingerprinting data (UPGMA) of the Salmonella-positive samples, based on a Dice coefficient. Three major clusters (C1 to C3) of related samples were defined. Samples from farm A and farm H are marked with green and red squares, respectively. Each key refers to a unique sample and corresponds to the keys in Table 2. For each ERIC-PCR fingerprint, band sizes, sources, and locations of the samples are shown.
