isolates, aztreonam-ceftazidime-avibactam and aztreonam-amoxicillin-clavulanate were found to be equal (100% susceptibility). Overall, aztreonam-ceftazidime-avibactam was the most potent combination to treat infections caused by MBL producers compared with aztreonam-amoxicillin-clavulanate and aztreonam-ceftolozane-tazobactam. However, in many cases aztreonam-amoxicillin-clavulanate was found to be as efficient as aztreonam-ceftazidime-avibactam, offering the main advantage to be markedly cheaper. We also confirmed the validity of Etest superpositions as a very simple method to determine MICs of aztreonam combinations.
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Emeraud et al. (2019) studied this question.