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Examples of disk diffusion inhibition zones for Enterococcus spp. with 5-μg vancomycin disks. (A) Cultures with sharp zone edges and zone diameters of ≥12 mm should be reported as susceptible. (B to D) Cultures with fuzzy zone edges (C and D) or colonies within the zone (B) should be reported as resistant, even if the zone diameter is ≥12 mm.
