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Scatterplot comparison of piperacillin-tazobactam and meropenem susceptibility testing by disk diffusion testing (x-axis; zone diameter) and broth microdilution (y-axis; minimum inhibitory concentration). The red dashed line represents the European Committee on Antimicrobial Susceptibility Testing susceptible breakpoint and the blue dashed line represents the Clinical and Laboratory Standards Institute susceptible breakpoint. Abbreviation: BMD, broth microdilution.
