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• W4377041737 abstract "Abstract Background Cefiderocol and ceftazidime-avibactam plus aztreonam (CZA-ATM) are preferred treatment regimens for New Delhi metallo-β-lactamase (NDM)-producing infections. Methods We report the case of a US patient who traveled to India to receive a renal transplant. He subsequently experienced pyelonephritis by an NDM-producing Escherichia coli. Broth microdilution and the broth disk elution method indicated resistance to all β-lactams, including cefiderocol and CZA-ATM. Whole-genome sequencing investigations were undertaken to identify resistance mechanisms. Results An E. coli isolate belonging to sequence type (ST) 167 containing a blaNDM-5 gene was identified on a plasmid of the IncFIA/IncFIB/IncFIC replicon groups. When compared with the genome of another ST167 E. coli clinical isolate containing blaNDM-5 and exhibiting susceptibility to cefiderocol and CZA-ATM, a 12–base pair insertion in ftsI, translating to a 4–amino acid duplication in PBP3, was identified. Moreover, a blaCMY-59 gene was harbored on an IncI-γ replicon type, and frameshift mutations were identified in the cirA iron transport gene. Conclusions This is the first clinical case of a US patient harboring an NDM-producing isolate exhibiting resistance to all available β-lactam agents. The isolate's unexpected resistance to cefiderocol and CZA-ATM was likely due to a combination of (1) a modified PBP3 (increased MICs to both regimens), (2) truncated iron-binding protein (increased cefiderocol MIC), and (3) a blaCMY gene (reduced CZA-ATM activity). E. coli ST167 clinical isolates harboring blaNDM-5 genes are a recognized international high-risk clone. When coupled with the additional mechanisms identified in our patient's isolate, which is not uncommon for this high-risk clone, pan-β-lactam resistance may occur." @default.
• W4377041737 created "2023-05-19" @default.
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• W4377041737 date "2023-05-17" @default.
• W4377041737 modified "2023-10-05" @default.
• W4377041737 title "An NDM-Producing <i>Escherichia coli</i> Clinical Isolate Exhibiting Resistance to Cefiderocol and the Combination of Ceftazidime-Avibactam and Aztreonam: Another Step Toward Pan-β-Lactam Resistance" @default.
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• W4377041737 doi "https://doi.org/10.1093/ofid/ofad276" @default.
• W4377041737 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37416757" @default.
• W4377041737 hasPublicationYear "2023" @default.
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