TABLE 2.

Etest minimum inhibitory concentrations (median and range) of ceftriaxone sodium and PPIX-MED alone and in combination.

	MIC (μg/ml)				FICI▲	Interpretation
	MICA	MICA(with B)	MICB	MICB(with A)
MRSA	128 μg/ml	64 μg/ml	16 μM	8 μM	1	Indifference
P. aeruginosa	32 μg/ml	16 μg/ml	32 μM	4 μM	0.625	Indifference
E. coli	64 μg/ml	16 μg/ml	32 μM	16 μM	0.75	Indifference

MIC_A, ceftriaxone sodium; MIC_B, PPIX-MED; MIC_{A(with B)}, ceftriaxone sodium with PPIX-MED; MIC_{B(with A)}, PPIX-MED with ceftriaxone sodium. ^▲ The fractional inhibitory concentration index (FICI) data were interpreted using the following criteria: synergistic effect, FICI ≤ 0.5; additive effect, FICI 0.5–1.0; irrelevant effect, FICI 1.0–2.0; and antagonistic effect, FICI ≥ 2.0.