TABLE 4.

Presence or absence of common integrase genes as determined by PCR and product size using primers 5′CS and 3′CS to amplify gene cassettes from class 1 integrons

Plasmid	Date (yr)	Presence (+) or absence (−) of:					Size (kb) of cassette
		intI1	intI2	intI3	qacEΔ1	sul1
pHCM1	1994	+	-	-	-	-	No product
pSTY1	1993	+	-	-	+	+	1
pSTY2	1992	+	-	-	+	+	1
pSTY3	1994	+	-	-	+	+	1
pSTY4	1994	+	-	-	+	+	1
pSTY5	1993	+	-	-	+	+	1
pSTY6	1993	+	-	-	+	+	1
pSTY7	1996	+	-	-	+	+	0.75
pCB	1994	+	-	-	+	+	0.75
pD6	1996	+	-	-	+	+	0.75