Table 2.

Comparison of vancomycin MICs determined by VITEK 2 with MICs determined by the reference agar dilution method for 195Enterococcus isolates

Organism (no.)No. of VITEK 2 vancomycin MICs within indicated log of reference MICAgreement (%)a
>−2−2−10+1+2>+2
vanA GRE (50)50100
vanB GRE (15)131193
vanC1 GRE (50)82214688
vanC2 GRE (30)2101893
GSE (50)6404100
Total222414319795
  • a Agreement percentage is given by 100 × (number of strains with reference drug MIC ± 1 dilution/total number of strains).