Mechanisms involved in cefiderocol resistance in French Pseudomonas aeruginosa clinical strains
This study characterizes the multifactorial mechanisms of cefiderocol resistance in French *Pseudomonas aeruginosa* clinical strains, identifying acquired -lactamases (particularly NDM-1 and ESBLs) and impaired siderophore uptake (notably via PirR inactivation) as the primary drivers of high-level resistance, underscoring the critical need for routine surveillance and caution when treating NDM-producing isolates.