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(A) Positive synergy test using disks containing DPA (250 μg) and imipenem (IMP, 10 μg) for a P. mirabilis isolate producing VIM-1. (B) The same isolate appearing MβL negative by DDST using a disk containing EDTA (975 μg). Tests were performed with Mueller-Hinton agar and an inoculum of 5 × 105 cells/ml.
