TABLE 2.

Yearly summary of the number of PFGE strain types and number of isolates involved in no dissemination (unique strains), intrahospital dissemination only, and interhospital dissemination

Yr	No. of PFGE strain types (no. of isolates)
	No dissemination (unique)	Intrahospital dissemination (only)	Interhospital dissemination	Total
1991	1 (1)	0	1 (1)	2 (2)
1992	1 (1)	1 (2)	1 (10)	3 (13)
1993	0	1 (1)	1 (10)	2 (11)
1994	1 (1)	3 (6)	3 (67)	7 (73)
1995	12 (12)	4 (11)	7 (79)	23 (102)
1996	31 (31)	5 (10)	13 (137)	49 (178)