Cefiderocol Retains Anti-Biofilm Activity in Multi-Drug Resistant Gram-Negative Pathogens.

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Cefiderocol Retains Anti-Biofilm Activity in Multi-Drug Resistant Gram-Negative Pathogens.

Antimicrob Agents Chemother. 2020 Nov 16;:

Authors: Pybus CA, Felder-Scott C, Obuekwe V, Greenberg DE

Cefiderocol is a siderophore cephalosporin with potent antibacterial activity against a broad range of Gram-negative pathogens, including multi-drug resistant strains. Siderophore antibiotics bind ferric iron and utilize iron transporters to cross the cell membrane. In the biofilm setting, where antibiotic resistance is high but iron scavenging is important, cefiderocol may have advantageous antimicrobial properties. In this study, we compared the antimicrobial activity of cefiderocol to seven commonly used antibiotics in well-characterized multi-drug resistant pathogens, then determined their efficacy in the biofilm setting. MIC90 values were consistently lower for cefiderocol in all strains tested compared to other antibiotics (ceftolozane-tazobactam, ceftazidime-avibactam, ceftazidime, piperacillin-tazobactam, imipenem, tobramycin, clarithromycin). Cefiderocol treatment displayed a superior reduction in Pseudomonas aeruginosa biofilm (93%, p<0.0001) compared to other antibiotics (49-82%). Cefiderocol was generally as effective or superior in reducing biofilm in other pathogens depending on the pathogen-antibiotic combination. There was a trend towards greater biofilm reduction when the antibiotic dose was increased or with increased frequency of antibiotic treatment. We conclude that cefiderocol effectively reduces biofilm and is a potent inhibitor of planktonic growth across a range of Gram-negative medically important pathogens.

PMID: 33199383 [PubMed - as supplied by publisher]