Table 1.

Susceptibilities of E. coli EPI300 strains containing recombinant plasmids and pCCl at different copy numbers.

Plasmid	Copy number per cell	MICs, mg/L
		AMP	CTX	CAZ	FEP	AZT
pCC-blaSH-3	1	1024	2	1	0.25	0.5
	10	≥2048	64	16	4	8
pCC-blaCTX-M-3	1	512	16	1	1	2
	10	≥2048	256	4	4	16
pCC-blaCTX-M-42	1	256	1	32	0.5	1
	10	≥2048	4	128	1	4
pCCl (bla negative)	1	2	0.25	0.5	≤0.125	0.25
	>10	2	0.25	0.5	≤0.125	0.25