MIC (mg/L)		Cumulative % inhibited at (mg/L):
Organism (no. tested/% of total)	50%	90%	0.25	0.5	1	2	4
S. aureus (SA; 2, 370/33)	0.25	0.5	85	99	100
Enterococci (1, 082/15)	≤0.12	0.25	92	>99	100
Coag-neg staphylococci (CoNS; 997/14)	0.25	0.5	74	97	100
P. aeruginosa (PSA; 549/8)	8	16	<1	1	2	6	20
E. coli (533/8)	0.25	0.5	87	99	100
Kiebsiella spp. (388/5)	0.5	1	35	79	93	98	100
Enterobacter spp. (285/4)	0.5	1	21	75	91	96	>99
β-haemolytic streptococci (143/2)	≤0.12	≤0.12	100
Acinetobacter spp, (ASP; 134/2)	1	2	21	37	67	96	99
S. pneumoniae (118/2)	≤0.12	≤0.12	100
Total (7,129)	0.25	2	68	84	89	91	94