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The relative proportion (%) of various antibacterial drug classes among all antibacterial drugs (in RDDs) dispensed in the acute care participant hospitals per year; 3°/4° Cephalosporins = third- and fourth-generation cephalosporins, including the new agents ceftazidime-avibactam, ceftolozane-tazobactam, ceftaroline, and cefiderocol; 1°/2° Cephalosporins = first- and second-generation cephalosporins. Broad-spectrum penicillins = piperacillin and piperacillin-tazobactam.
