Synergy test. Antibacterial activity of peptides combined with antibiotics. C (ciprofloxacin), V (vancomycin)^a.

Bacterial strain		Antibiotic	Peptide	MICA	MICP	A	P	FIC, index	MICA/A	Activity
Gram negative	E. coli 25 922	C	LfcinB (20–25)2	0.09	25	0.006	0.75	0.09	15	S
	E. coli 11 775	C	LfcinB (21–25)Pal	0.04	50	0.020	50	1.50	2	I
	P. aeruginosa 27 853	C	LfcinB (20–25)4	0.40	100	0.020	3.1	0.09	20	S
Gram positive	E. faecalis 29 212	V	LfcinB (20–30)4	6.4	400	0.200	12.5	0.06	32	S
			LfcinB (21–25)Pal	6.4	200	0.100	25	0.14	64	S
	S. aureus 25 923	V	LfcinB (21–25)Pal	6.4	400	0.060	0.06	0.01	107	S
			LfcinB (20–25)4	6.4	100	0.100	3.1	0.04	64	S

^aMICA, MICP,A and P in μg mL⁻¹. S: synergy; I: indifference.