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. 2020 Dec 10;9(12):888. doi: 10.3390/antibiotics9120888

Table 2.

Interpretation of susceptibility to oxacillin and vancomycin by the E-test.

Antimicrobial
Oxacillin Vancomycin
Species MIC50 MIC90 Resistant MIC50 MIC90 Resistant
S. aureus 0.094 0.25 1 0.50 1.0 0
CoNS 0.25 1.5 32 1.0 1.5 0

Oxacillin breakpoint: Staphylococcus aureus: susceptible ≤2; resistant ≥4 µg/mL. CoNS (coagulase-negative Staphylococcus): susceptible ≤0.25; resistant ≥0.5 µg/mL. Vancomycin breakpoint: Staphylococcus spp.: susceptible <4 [23]. MIC, minimum inhibitory concentration.