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Abstract

The first reports of carbapenem-resistant in our hospital date back to 2006. In that period, few ertapenem-resistant but meropenem-susceptible isolates belonging to sequence type (ST) 37 were retrieved from clinical samples. These strains produced the CTX-M-15 extended spectrum β-lactamase, OmpK35 was depleted due to a nonsense mutation, and a novel OmpK36 variant was identified. Yet, starting from 2010, carbapenemase (KPC)-producing ST512 isolates started prevailing and ST37 vanished from sight. Since 2018 the clinical use of the combination of ceftazidime–avibactam (CZA) has been introduced in clinical practice for the treatment of bacteria producing serine-β-lactamases, but KPC-producing, CZA-resistant are emerging. In 2021, four CZA-resistant ST37 isolates producing KPC variants were isolated from the same number of patients. KPC gene cloning in was used to define the role of those KPC variants on CZA resistance, and whole genome sequencing was performed on these isolates and on three ST37 historical isolates from 2011. CZA resistance was due to mutations in the KPC genes carried on related pKpQIL-type plasmids, and three variants of the KPC enzyme have been identified in the four ST37 strains. The four ST37 isolates were closely related to each other and to the historical isolates, suggesting that ST37 survived without notice in our hospital for 10 years, waiting to re-emerge as a CZA-resistant clone. The ancestor of these contemporary isolates derives from ST37 wild-type porin strains, with no other mutations in chromosomal genes involved in conferring antibiotic resistance (, , , , ).

Keyword(s): endemicity , KPC , pKpQIL and ST37
Funding
This study was supported by the:
  • Istituto Pasteur-Fondazione Cenci Bolognetti
    • Principle Award Recipient: AlessandraCarattoli
  • Sapienza Università di Roma (Award 000307_ATENEO_2021_CARATTOLI_RM12117A70BE8124)
    • Principle Award Recipient: CarattoliAlessandra
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2023-02-08
2025-02-14
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