TABLE 2.

Discriminatory indices and numbers of clusters and PFGE profiles of 55 strains^a

Enzymes used	No. of PFGE patterns	No. of clustersb	Discriminatory index
SacII	33	12	0.945
SmaI	29	12	0.941
XhoI	32	11	0.941
SacII + SmaI	37	10	0.943
SacII + XhoI	38	10	0.952
SmaI + XhoI	36	11	0.941
SacII + SmaI + XhoI	37	10	0.949

^aProduced with different enzymes alone and combined data sets based on an analysis with BioNumerics software.

^bCluster refers to a group of strains at a 95% similarity level.