TABLE 1.

Bacterial strains used in this study

StrainRelevant characteristicsaReference(s)
E. faecium
    TUH2-21Epidemic human clinical strain; Apr Vms12
    TUH2-18Clonally related to TUH2-21; chromosomal vanB2; Apr Vmr6, 12
    TUH2-19Clonally related to TUH2-21; plasmid vanB2; Apr Vmr12
    TUH2-20Clonally related to TUH2-21; chromosomal vanB2; Apr Vmr12
    TUH2-55Clonally related to TUH2-21; plasmid vanB2; Apr Vmr12
    BM4105-RFRecipient strain in transfer studies; Vms Rifr Fusr20
E. faecalis
    JH2-2Recipient strain in transfer studies; Vms Rifr Fusr13
    UV202Recombination-deficient derivative of JH2-223
  • a Apr, ampicillin resistant; Vms, vancomycin susceptible; Vmr, vancomycin resistant; Rifr, rifampicin resistant; Fusr, fucidic acid resistant. The TUH strains were isolated at Haukeland University Hospital, Bergen, Norway (12).