TABLE 1.

Analysis of susceptibility tests showing synergy between tobramycin and ceftazidime against four P. aeruginosa strains

Strain	MIC (mg/liter)a		MICcombi (mg/liter)b		FICic
	Tobra- mycin	Ceftazidime	Tobra- mycin	Ceftazidime	E-test	Macro- dilution method
CF 133	32	64	6	16	0.44	0.37
CF 5706	128	16	32	6	0.63	0.68
CF 5846	12	512	6	128	0.75	0.67
CF 5879	16	512	1.5	8	0.10	0.39

^aDetermined by E-test. 

^bDetermined by combination E-test. 

^cCalculated; see Materials and Methods.