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Genetic relationship between 8 E. rhusiopathiae field isolates and 1 vaccine strain and schematic representation of 8 different PFGE patterns obtained after restriction digestion with Sma I. The classification and divergence of isolates were calculated by the unweighted pair group method with averages from the PFGE results. At 5% divergence, 3 PFGE groups (A-C) were present; group A was subgrouped into A1/A2 at 3.5% divergence.
