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Background: Avibactam is a member of a class of inhibitors called diazabicyclooctanes (DBOs) that does not contain a β-lactam core but maintains the capacity to covalently acylate its β-lactamase targets.This study aims to determine in-vitro activity of ceftazidime-avibactam and aztreonam-avibactam against gram-negative bacilli including different β-lactamases-producers from 11 teaching hospitals in China.