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Comparison of inhibition zone diameters produced by disks with imipenem and imipenem plus 750 μg of EDTA. (A) Scattergram comparing inhibition zone diameters. Boldface indicates imipenem-resistant or -intermediate, but MBL-negative isolates, and lightface indicates MBL-positive isolates. (B) Increased inhibition zones with imipenem-EDTA disks. IMP, imipenem.
