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PFGE dendrogram of 102 isolates produced following Dice and UPGMA analysis of SmaI-digested DNA. One large group (I) could be discerned (see text). Distribution of the isolates according to hospital site (hospital codes refer to the 10 hospitals that participated), esp positivity, year of isolation, source of isolation, purK and pbp5 alleles, ampicillin susceptibility, and AFLP groups I to III are shown.
