Abstract
Metallo-β-lactamase (MBL)-producing Enterobacteriaceae , particularly those that coharbor serine β-lactamases, are a serious emerging public health threat given their rapid dissemination and the limited number of treatment options. Preclinical and anecdotal clinical data support the use of aztreonam in combination with ceftazidime-avibactam against these pathogens, but other aztreonam-based combinations have not been explored.

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