$\mathrm{FIC}:\frac{\mathrm{MICA}}{\mathrm{MICextract}}+\frac{\mathrm{MICB}}{\mathrm{MICdrug}}=$	FIC ≤ 0.5: synergistic effect
	0.5 < FIC ≤ 1: additive effect
	1.0 < FIC ≤ 4: no interaction
	FIC > 4: antagonism