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(A) Penicillin MICs and amdinocillin disk zone diameters recorded with 102 selected strains tested in one laboratory (UTHSCSA). (B) Ampicillin MICs and amdinocillin disk zone diameters recorded with 102 selected strains tested in one laboratory (UTHSCSA). The vertical line represents the single proposed zone diameter breakpoint for screening purposes. Strains with known altered PBP2 are indicated in boxes. Strains that were not examined for PBP2 alterations are indicated by asterisks.
