The study identifies 11 genes in Acinetobacter baylyi whose disruption leads to antibiotic hypersusceptibility, including genes involved in efflux pumps, peptidoglycan synthesis, and other metabolic pathways.

The study identified a mutation in ampD leading to hyperproduction of AmpC beta-lactamase in Cedecea davisae, resulting in resistance to beta-lactam antibiotics.

The study identifies multiple mutations in genes such as ampD, deoR, wecA, rcsC, ompC, ompD, and phoE that contribute to antibiotic resistance in Enterobacter hormaechei. These mutations include transposon insertions, deletions, and frameshift variants, leading to resistance against β-lactams, carbapenems, and other antibiotics.

The study identifies a novel deletion in ampD and ampE associated with cefepime resistance and a porin mutation in oprD linked to carbapenem resistance in Pseudomonas aeruginosa during treatment.

The study reports the emergence of cefiderocol resistance in Pseudomonas aeruginosa due to a large genomic deletion encompassing ampD and piuCD genes, which was likely selected by ceftazidime/avibactam treatment.

Cefepime-taniborbactam showed potent in vitro activity against Enterobacterales and P. aeruginosa, particularly effective against isolates with carbapenemase genes such as blaIMP, blaNDM, and blaVIM, as well as those with mutations in ftsI, ompK35, and ompK36.

The study characterizes various carbapenemase genes such as blaIMP-13, blaIMP-94, blaNDM-1, blaNDM-5, blaNDM-7, blaNDM-23, blaVIM-1, blaVIM-2, blaVIM-20, blaKPC-2, blaKPC-3, blaGES-1, blaGES-5, blaGES-7, blaGES-20, blaPER-1, blaVEB-1, blaCTX-M-15, blaCTX-M-9, blaSHV-12, blaFOX-4, blaCMY-2, blaDHA-1, blaOXA-2, blaOXA-10, blaOXA-14, blaOXA-15, and blaOXA-48 in Pseudomonas aeruginosa using MALDI-TOF MS hydrolysis assays.