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Dendrogram produced following Dice and UPGMA analysis of the PFGE patterns of SmaI-digested DNA. The percent similarities and band differences between and within clusters are shown. The corresponding ribotype, biotype, and PyMS type of each isolate are also included. *, two of the PFGE pattern 3a isolates were ribotype IIa and five were ribotype IIb; #, one of the PFGE pattern 4f isolates was PyMS type py-4 and the other was PyMS type py-5.
