TABLE 1.

Bacterial strains and MIC values of selected agents

StrainDate of isolation (day.mo.yr)Specimen and relevant characteristicsMIC (μg/ml)aBeta-lactamase produced
AMPIPMCTXVCM
Enterococcus faecalis
    SEF9621.04.2000Clinical isolate from urine11>2561
    ATCC 29212Type strain112564
    SVR 3415.02.2000Clinical isolate with vanB from urine84>25632
    SVR 13827.05.2002Clinical isolate with vanA from stool88>256>512
    SVR 25019.07.2002Clinical isolate with vanA from urine10.564>512
    SVR 25119.07.2002Clinical isolate with vanA from urine10.564>512
    SVR 111002.09.2000Clinical isolate with vanA from urine1632>256>512
    SVR 111901.12.1998Clinical isolate with vanA from urine1632>256>512
    SVR 1119SΔvanA; spontaneous mutant derived from SVR 11191632>2561
Escherichia coli
    ATCC 35218Beta-lactamase-positive strain+
  • a Abbreviations: AMP, ampicillin; IPM, imipenem; CTX, cefotaxime; VCM, vancomycin.