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Correlation of zone diameters as measured with a Sirscan image analyzer to caliper readings. Dark lines represent the NCCLS breakpoints. ○, automatic reading; X, reviewed reading. (A) Penicillin disk with 127 clinical isolates of staphylococci. (B) Vancomycin disk with 127 staphylococci. (C) Ampicillin disk with 209 gram-negative isolates.
