Table 4.

Minimum inhibitory concentration (MIC) of Escherichia coli strains.

	CAZ	ERT	MEM	GEN
E. coli ATCC 25922	0.5 (S)	0.016 (S)	0.03 (S)	0.5 (S)
E. coli M19736	0.03 (S)	0.5 (S)	0.25 (S)	0.03 (S)
E. coli J53	0.25 (S)	0.08 (S)	0.03 (S)	0.5 (S)
E. coli SM5	64 (R)	0.12 (S)	0.06 (S)	0.5 (S)
E. coli M19736::pDCAG1-CTX-M-15	>64 (R)	0.5 (S)	0.25 (S)	0.03 (S)
E. coli J53::pDCAG1-CTX-M-15	64 (R)	0.08 (S)	0.03 (S)	0.5 (S)
K pneumoniae HA7Kp	32 (R)	8 (R)	8 (R)	0.25 (S)
E. coli M19736::pDCCK1-KPC	32 (R)	4 (R)	2 (I)	0.03 (S)
E. coli J53::pDCCK1-KPC	16 (R)	2 (R)	4 (R)	0.5 (S)
K. pneumoniae HA31Kp	>64 (R)	32 (R)	32 (R)	>64 (R)
E. coli M19736::pDCVA3-NDM-5	>64 (R)	64 (R)	32 (R)	0.03 (S)
E. coli J53::pDCVA3-NDM-5	>64 (R)	2 (R)	4 (R)	0.5 (S)
S. marcescens SM938	>64 (R)	8 (R)	8 (R)	2 (S)
E. coli M19736::pDCASG-NDM-1	>64 (R)	16 (R)	8 (R)	0.03 (S)
E. coli J53::pDCASG-NDM-1	>64 (R)	32 (R)	16 (R)	0.5 (S)
Evolved MDR-E. coli M19736	>64 (R)	32 (R)	16 (R)	0.03 (S)
Evolved XDR-E. coli M19736	>64 (R)	32 (R)	16 (R)	32 (R)

Results were interpreted according to the Clinical and Laboratory Standards Institute guidelines (CLSI, 2023).

CAZ, ceftazidime; ERT, ertapenem; MEM, meropenem; GEN, gentamicin. Interpretation results: I, intermediate; R, resistance; S, susceptible.