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Diffusion tests using commercial disks. Zones of inhibition around oxacillin, penicillin, and ampicillin disks for selected test strains, using Mueller-Hinton agar, supplemented with 2% NaCl (A), 2% NaCl and 1 μg/ml teicoplanin (B), 1 μg/ml teicoplanin (C), or 0.25 μg/ml vancomycin (D), as the test medium.
