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Results from determination of antibacterial activity of piperacillin-tazobactam, ceftazidime, cefepime and meropenem by disc diffusion test from the test series in PBS. Piperacillin and tazobactam had to be tested in combination for this assay. Data are presented as means of triplicates of the diameter of the zone of inhibition in mm, with error bars indicating standard deviation. The horizontal line at 6 mm indicates the diameter of the paper disc.
