TABLE 1.

MIC determinations before and after conversion from heterotypic to homotypic resistancea

StrainMIC (μg/ml)
OxacillinVancomycin
BeforeAfterBeforeAfter
RN450M1>51214
N3154>51214
67-0825618
BMS1112814
SE600.5>51224
SE5312560.52
SE420.25>51214
SE208>51214
  • a Cells of each strain were converted to the homotypic resistance phenotype by growth for 24 h in 0.7 to 1.0 μg of oxacillin per ml.