Table 2.

MIC (µg ml⁻¹) interpretation of E. faecium Am1 and Bee9 detected by VITEK 2 as per CLSI guidelines

Antimicrobial	MIC value (interpretation*)
	Am1	Bee9
Ampicillin	≤ 2 (S)	≤ 2 (S)
Imipenem	≤ 1 (S)	≤ 1 (S)
Gentamicin high level (synergy)	SYN-S (S)	SYN-S (S)
Streptomycin high level (synergy)	SYN-S (S)	SYN-S (S)
Ciprofloxacin	≤ 0.5 (S)	≤ 0.5 (S)
Erythromycin	1 (I)	1 (I)
Linezolid	4 (I)	2 (S)
Teicoplanin	≤ 0.5 (S)	≤ 0.5 (S)
Vancomycin	≤ 0.5 (S)	≤ 0.5 (S)
Tetracycline	≤ 1 (S)	≤ 1 (S)
Tigecycline	≤ 0.12 (S)	≤ 0.12 (S)

*Interpretation of MIC values S (susceptible) and I (intermediate) according to the CLSI [20].