Vancomycin Sensitive S. aureus, VISA and VRSA
Most Staphylococcus aureus strains are sensitive to antibiotic vancomycin. The concentration of vancomycin required to inhibit these strains (minimal inhibitory concentration - MIC) is 0.5-2 micrograms/mL. S. aureus strains for which vancomycin MICs are 4-8 micrograms/mL are classified as Vancomycin Intermediate Staphylococcus aureus - VISA, and strains for which vancomycin MICs is equal or exceeds 16 micrograms/mL are classified as Vancomycin Resistant Staphylococcus aureus – VRSA (1).
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