TABLE 2.

MICs of growth-enhancing antibiotics for E. faecium and E. faecalis strains from animals and foods

Antibiotic	Sp.	No. of strains with MICa:
		≤0.12	0.25	0.5	1	2	4	8	16	32	>32
Avilamycin	E. faecium	13	50	105	27	2					2
	E. faecalis	1	22	90	40	1
Avoparcin	E. faecium			7	115	70	4				2
	E. faecalis				8	111	31	4
Bacitracin	E. faecium	15	24	14	21	44	49	2	7	10	14
	E. faecalis			17	11	43	59				24
Tylosin	E. faecium		1	10	51	43	3		1	22	68
	E. faecalis					37	21	12		1	83
Virginiamycin	E. faecium		27	36	50	44	26	7	9	7	3
	E. faecalis			2	6	58	54	25	7	1	1
Narasin	E. faecium	25	132	7	4	22	8	1
	E. faecalis	12	133	7	1		2

^aMicrograms per milliliter, except that MICs of bacitracin are expressed in international units per milliliter.