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UPGMA clustering analysis of human L. monocytogenes isolate ApaI PFGE patterns and selected L. monocytogenes watershed isolates using the Dice coefficient with a tolerance of 1.5%. L. monocytogenes NS human food-borne outbreak isolates are labeled “human,” MR L. monocytogenes isolates are labeled “rural river,” and LF isolates are labeled “urban stream.”
