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Rates of nonsusceptibility of P. aeruginosa isolates to one, two, three, or four β-lactam antibiotics and percentage of nonsusceptible isolates remaining susceptible to ceftolozane-tazobactam. Definitions: CAZ, ceftazidime; C/T, ceftolozane-tazobactam; FEP, cefepime; MEM, meropenem; NS, nonsusceptible; TZP, piperacillin-tazobactam; S, susceptible.
