TABLE 4.

Summary of PCR experiments^a

ECOR strain no.	PCR result with the indicated primer pairb
	int1.F-int1.R	sul.F-sul.R	qac.F-qac.R	merA1–merA5	merR1–merT1	int1.R-qac.F	int1.R-aadA.R	IRT-merA1	IRI-int1.F	merT1–38/-
3	+	+	+	+	+	+	+	+	+	+
4	−	−	−	ND	ND	ND	ND	ND	ND	ND
6	−	−	−	ND	ND	ND	ND	ND	ND	ND
10	−	−	−	ND	ND	ND	ND	ND	ND	ND
16	−	−	−	ND	ND	ND	ND	ND	ND	ND
17	−	−	−	ND	ND	ND	ND	ND	ND	ND
18	−	−	−	ND	ND	ND	ND	ND	ND	ND
19	−	−	−	ND	ND	ND	ND	ND	ND	ND
24	−	−	−	ND	ND	ND	ND	ND	ND	ND
25	−	−	−	ND	ND	ND	ND	ND	ND	ND
30	−	−	−	ND	ND	ND	ND	ND	ND	ND
31	+	+	+	+	+	+	−	−	+	+
37	+	+	+	+	+	+	+	+	+	+
38	−	−	−	ND	ND	ND	ND	ND	ND	ND
39	−	−	−	ND	ND	ND	ND	ND	ND	ND
48	+	+	+	+	+	+	+	+	+	+
54	−	−	−	ND	ND	ND	ND	ND	ND	ND
70	−	−	−	ND	ND	ND	ND	ND	ND	ND

^aPCR regimens and antimicrobial agents tested are listed in Materials and Methods. 

^b+, PCR amplification product; −, no amplification product; ND, not determined.