FIG. 3.

Cluster of the composite data set and ERIC and (GTG)₅ fingerprints of 55 genetically different strains belonging to 10 serotypes. The similarities between the fingerprints were calculated using the Pearson correlation (optimization, 1%; position tolerance, 1%), and the fingerprints were grouped according to their similarities by use of the UPGMA algorithm. The vertical grey line shows the delineation level of 92.5%. The last column shows the strain numbers. The grey bar at the top of the figure shows the part (79.3% to 84.3%) of the ERIC fingerprints that is not taken into account to calculate the cluster, as explained in the text.