TABLE 2.

Susceptibility results for ESBL-positive isolates by BMD

Isolate	MIC in μg/ml (isolate resistance categorya)
	CAZ	CAZ+CAb	CTX	CTX+CA	CRO	CRO+CAc	ATM	ATM+CAc	CPD	CPD+CAc
Citrobacter amalonaticus 4026	2 (S)	0.5	8 (S)	0.5	>64 (R)	0.5	>64 (R)	16	8 (R)	2
Citrobacter freundii 3757	128 (R)	2	64 (R)	0.5	64 (R)	2	>64 (R)	0.25	128 (R)	8
Enterobacter aerogenes 3701	4 (S)	0.25	4 (S)	≤0.03	4 (S)	≤0.06	4 (S)	≤0.03	32 (R)	≤0.06
Enterobacter cloacae 53	32 (R)	0.12	16 (I)	0.06	16 (I)	≤0.06	64 (R)	0.5	32 (R)	0.5
Enterobacter cloacae 3146	128 (R)	0.5	16 (I)	0.5	32 (I)	0.5	>64 (R)	0.25	64 (R)	2
Proteus mirabilis 3750	32 (R)	0.12	0.5 (S)	≤0.03	≤0.06 (S)	≤0.06	0.25 (S)	≤0.03	8 (R)	≤0.06
Proteus penneri 1767	0.12 (S)	0.12	16 (I)	≤0.03	>64 (R)	≤0.06	0.06 (S)	≤0.03	32 (R)	≤0.06
Proteus vulgaris 1781	≤0.06 (S)	≤0.06	1 (S)	≤0.03	64 (R)	≤0.06	≤0.03 (S)	≤0.03	1 (S)	0.12
Proteus vulgaris 1405	≤0.06 (S)	≤0.06	8 (S)	≤0.03	>64 (R)	≤0.06	≤0.03 (S)	≤0.03	128 (R)	≤0.06
Proteus vulgaris 1699	≤0.06 (S)	≤0.06	32 (I)	≤0.03	>64 (R)	≤0.06	≤0.03 (S)	≤0.03	128 (R)	≤0.06
Proteus vulgaris 1765	≤0.06 (S)	≤0.06	2 (S)	0.06	>64 (R)	≤0.06	≤0.03 (S)	≤0.03	>128 (R)	0.12
Serratia marcescens 91	128 (R)	0.25	>64 (R)	2	>64 (R)	2	>64 (R)	1	>128 (R)	4
Serratia marcescens 167	64 (R)	0.25	64 (R)	1	>64 (R)	0.5	>64 (R)	1	>128 (R)	4
Serratia rubidaea 3139	64 (R)	1	0.25 (S)	0.5	0.5 (S)	0.12	2 (S)	0.25	4 (I)	0.25
Serratia rubidaea 3134	32 (R)	1	0.5 (S)	0.25	0.5 (S)	0.25	2 (S)	0.25	2 (S)	0.5

^aS, susceptible; I, intermediate; R, resistant.

^bA fixed concentration of 4 μg of CA per ml was used in conjunction with each antimicrobial agent.

^cCRO+CA, ATM+CA, and CPD+CA are not recommended by NCCLS as ESBL confirmatory tests.