44 Chapter 2 Antibiotic Antibiotic Spectrum Index ATC code Piperacillin 4 J01CA Piperacillin-tazobactam 8 J01CR Rifampin 3 J04AB Telavancin 5 J01XA Ticarcillin-clavulanate 6 J01CR Tigecycline 13 J01AA Tobramycin 5 J01GB Trimethoprimsulfamethoxazole 4 J01EE Vancomycin 5 J01XA Supplement 3b. Missing antibiotic in antibiotic spectrum index. Antibiotic Antibiotic Spectrum Index ATC code Amphenicols* 4 J01BA Beta-lactamase inhibitors* 6 J01CG Flucloxacillin* 1 J01CF Fosfomycin* 1 J01XX Macrolides** 3.5 J01FA Nitrofurantoin* 1 J01XE Norfloxacin* 8 J01MA Other quinolones 8 J01MB Quinolones** 8.5 J01MA Streptogramins* 5 J01FG Streptomycins* 5 J01GA Tetracyclines* 5 J01AA Trimethoprim* 1 J01EA * In incidental cases that was no index number in the ASI for an antibiotic, an index number was calculated based on activity against micro organisms. If this was not possible, the antibiotic(group) was excluded from the analysis. ** Average ASI had to be calculated for the ATC subgroups macrolides and quinolones, as the different antibiotics within these ATC subgroups showed different ASIs. For each subgroup, the ASI was calculated based on a weighted average level of antibiotic prescriptions.
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