TABLE 1.

E. faecalis strains used in time-kill and synergism studies

Strain	Relevant characteristic(s)	Reference	Bla+	MIC (μg/ml)			HLR to aminoglycosides		Synergisma
				BPR	AMPd	VANe	GENf	STRg
TX0630	Blood isolate from Argentina recovered in 1990	4	Yes	0.25	1	0.5	Yes	No	Yes
TX5070	JH2-7 transconjugant resulting from mating with a bla+ strain (HH-22), thymine auxotroph	12	Yes	0.125b	8b	8b	Yes	No	Yes
TX2484	Houston blood isolate, 1994, VanB	4	No	0.5	0.5	>256	No	Yes	Yes
TX2784	Human fecal isolate from Spain, 1998, VanA	18	No	0.25	0.5	>256	No	Yes	Noc

^aWith either 10 μg/ml gentamicin or 25 μg/ml streptomycin when appropriate.

^bDetermined with BHI agar since TX5070 does not grow on Mueller-Hinton agar. E. faecalis ATCC 29212 was used as a control.

^cDecrease in the number of CFU per milliliter of >1 log₁₀ but <2 log₁₀ versus BPR at 24 h.

^dAMP, ampicillin.

^eVAN, vancomycin.

^fGEN, gentamicin.

^gSTR, streptomycin.