The high expression of AmpC enzyme caused by chromosomal mutation is also the main reason why Pseudomonas aeruginosa and most enterobacteriaceae bacteria are resistant to broad-spectrum β -lactams drugs. Common β -lactamase inhibitors, such as clavulanic acid, sulbactam and tazobactam, have no obvious inhibitory effect on AmpC, but avermectin has inhibitory effect on AMPC.
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