TABLE 2.

ESBL phenotype confirmatory test result (BSAC double-disc synergy method)^a

Lab or strain	Isolate	CTX zone diam (mm)	CTX + AMC zone diam (mm)	CAZ zone diam (mm)	CAZ + AMC zone diam (mm)
892	E. coli	0	10	2	10
302	E. coli	0	10	2	10
957	E. coli	1	10	3	10
001	E. coli	0	8	3	10
Positive control	UZA 1789	4	10	3	10
Negative control	NCTC 10418	20	10	15	10

^aCTX, cefotaxime; CAZ, ceftazidime; AMC, amoxicillin-clavulanic acid.