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ERIC-PCR dendrogram showing the clustering of the 118 recovered shellfish strains, of which one A. butzleri (*) and five A. molluscorum (*) strains were obtained on more than one occasion from different samples taken on equal or different months and/or years. The similarity used to define clusters A and B is between 30% and 40%, based on the cutoff similarity of the clustering of the most prevalent species, A. butzleri and A. molluscorum.
