Table 1. Susceptibility to antibiotics of S. maltophilia benzalkoniumbenzalkonium chloride resistant mutants, and their complemented derivatives.

MIC (mg/L)	Strains
	D457 (wt)				Bz4			Bz6
Plasmid		pVLT31	pBS37	pBS41		pVLT31	pBS42		pVLT31	pBS38
Amikacin	8	4	3	4	8	6	8	16	16	16
Gentamicin	2	2	2	2	2	2	2	2	3	3
Aztreonam	24	12	16	12	>256	>256	>256	128	48	48
Cefepime	16	12	16	12	48	48	48	24	24	24
Ceftazidime	0.38	0.25	0.5	0.38	1.5	1	1.5	1	1.5	1.5
Piperacillin	64	48	64	48	>256	>256	>256	>256	>256	>256
Polymyxin B	6	6	6	6	12	6	6	12	6	6
Chloramphenicol	6	8	6	6	6	6	8	6	12	12
Gatifloxacin	0.125	0.125	0.190	0.125	0.38	0.38	0.38	2	1.5	1.5
Levofloxacin	0.38	0.25	0.38	0.25	0.5	0.5	0.5	2	1.5	1.5
Ofloxacin	0.75	0.75	0.75	0.75	1.5	1.5	1.5	8	8	6
Ciprofloxacin	1	1.5	1.5	1	2	2	2	>32	>32	>32