Gram-negative bacteria Gram-positive bacteria Sample 1: control without antibiotic Sample 1: control without antibiotic Sample 2: mezlocillin 128 µg/ml Sample 2: oxacillin 0.25 µg/ml Sample 3: piperacillin 128µg/ml Sample 3: piperacillin 1 µg/ml+ tazobactam 0.1 µg/ml Sample 4: cefazolin 8 µg/ml Sample 4: cefazolin 1 µg/ml Sample 5: cefuroxime 8 µg/ml Sample 5: cefuroxime 1 µg/ml Sample 6: ciprofloxacin 2 µg/ml Sample 6: ciprofloxacin 1µg/ml Sample 7: gentamicin 6 µg/ml Sample 7: gentamicin 2 µg/ml

Table 1: Samples for the flow cytometric susceptibility test of Gram-negative and Gram-positive bacteria. Depending on Gram classification different penicillins and different concentrations of the other antibiotics were used.