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Table 1 MICs by microdilution and Etest and disk diffusion inhibition zones in 108 rifampicin resistant MRSA isolates.

From: Molecular characterization of resistance to Rifampicin in an emerging hospital-associated Methicillin-resistant Staphylococcus aureus clone ST228, Spain

Microdilution MICs No. of strains E-test (range) MICs Inhibition zones by disk diffusion No. of strains
    ≤ 16 mm 17-19 mm ≥ 20 mm
2 mg/L 97 0.75-2 mg/L 15 62 20
4 mg/L 7 3-4 mg/L 7 - -
128 mg/L 2 > 32 mg/L 2 - -
≥ 256 mg/L 2 > 32 mg/L 2 - -