Table 1.

Minimum Inhibitory Concentrations and Fractional Inhibitory Values of 600 Da BPEI in Combination with Various Antibiotics against MRSA^a

	MRSA MW2		MRSA USA300		MRSA 252		MRSA 33592
	MIC	FICI	MIC	FICI	MIC	FICI	MIC	FICI
600-Da BPEI	64	-	32	-	32	-	32	-
oxacillin	32	0.250	32	0.266	>256	0.501	256	0.281
ampicillin	128	0.188	2	0.516	256	0.375	256	0.516
amoxicillin	128	0.250	4	0.5	256	0.500	256	0.375
piperacillin	>256	0.266	16	0.313	>256	0.501	>256	0.501
imipenem	0.5	0.375	0.25	0.25	64	0.508	32	0.281
meropenem	2	0.313	4	0.250	32	0.504	8	0.563
ceftizoxime	>256	0.156	256	0.313	>256	0.254	>256	0.5
cephalothin	4	0.5	2	0.5	32	0.281	32	0.375
vancomycin	1	1	1	1	1	1	2	0.504
linezolid	2	0.5	1	0.5	1	0.5	1	0.5

^aEach value is the average of three separate trials.