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Minimum inhibitory concentrations of aztreonam–avibactam, ceftazidime–avibactam and meropenem in clinical isolates of Klebsiella pneumoniae harboring carbapenemase genes

The Journal of Antibiotics volume 77, pages 706–710 (2024)Cite this article

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Abstract

This study was aimed at understanding the distributions of the MICs (minimum inhibitory concentrations) of aztreonam–avibactam, ceftazidime–avibactam and meropenem with respect to Klebsiella pneumoniae isolates producing different types of carbapenemases and their combinations. K. pneumoniae isolates were collected between 2019 and 2022 from 37 hospitals. PCR was used to screen for blaKPC-, blaNDM- and blaOXA-48-like genes. MICs were determined by the broth microdilution method for meropenem, aztreonam–avibactam and ceftazidime–avibactam at a constant avibactam concentration of 4 mg l−1. MIC distributions were analyzed for groups of isolates based on the identified carbapenemases including their combinations. The AZT/AVI MIC50 and MIC90 for all NDM-positive isolates were 0.25 and 0.5, respectively, and for serine-carbapenemase-only producers, they were 0.25 and 1 mg l−1, respectively. The CZD/AVI MIC50 and MIC90 values for serine-carbapenemase-only producers were 1 and 4 mg l−1, respectively. The AZT/AVI MIC50 and MIC90 values for co-producers and single carbapenemase producers were the same (i.e., 0.25 and 1 mg l−1, respectively). The total proportion of meropenem-susceptible isolates (≤8 mg l−1) among all the carbapenemase producers was 25.1% (31.1% among single-carbapenemase producers and 9.2% among co-producers). The results support the use of aztreonam–avibactam for the empirical treatment of infections caused by any carbapenemase producers.

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Acknowledgements

The authors are grateful to the technical specialist Olga Gul.

Funding

This research was funded by the Russian Science Foundation, grant number 21-74-10090.

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Authors and Affiliations

  1. Pediatric Research and Clinical Center for Infectious Diseases, Saint Petersburg, Russian Federation

    Vladimir Ageevets, Ofelia Sulian, Alisa Avdeeva, Polina Chulkova, Irina Ageevets, Vladimir Gostev & Sergey Sidorenko

  2. Department of Microbiology, Saint Petersburg State University, Saint Petersburg, Russian Federation

    Alisa Avdeeva

  3. Department of Pharmacokinetics and Pharmacodynamics, Gause Institute of New Antibiotics, Moscow, Russian Federation

    Kamilla Alieva & Maria Golikova

Authors
  1. Vladimir Ageevets
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  2. Ofelia Sulian
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Correspondence to Vladimir Ageevets.

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Ageevets, V., Sulian, O., Avdeeva, A. et al. Minimum inhibitory concentrations of aztreonam–avibactam, ceftazidime–avibactam and meropenem in clinical isolates of Klebsiella pneumoniae harboring carbapenemase genes. J Antibiot 77, 706–710 (2024). https://doi.org/10.1038/s41429-024-00758-8

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