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Diminished Susceptibility to Cefoperazone/Sulbactam and Piperacillin/Tazobactam in Enterobacteriaceae Due to Narrow-Spectrum β-Lactamases as Well as Omp Mutation Cover

Diminished Susceptibility to Cefoperazone/Sulbactam and Piperacillin/Tazobactam in Enterobacteriaceae Due to Narrow-Spectrum β-Lactamases as Well as Omp Mutation

Open Access
|Jun 2022

Abstract

Cefoperazone/sulbactam (CSL) and piperacillin/tazobactam (TZP) are commonly used in clinical practice in China because of their excellent antimicrobial activity. CSL and TZP-nonsusceptible Enterobacteriaceae are typically resistant to extended-spectrum cephalosporins such as ceftriaxone (CRO). However, 11 nonrepetitive Enterobacteriaceae strains, which were resistant to CSL and TZP yet susceptible to CRO, were collected from January to December 2020. Antibiotic susceptibility tests and whole-genome sequencing were conducted to elucidate the mechanism for this rare phenotype. Antibiotic susceptibility tests showed that all isolates were amoxicillin/clavulanic-acid resistant and sensitive to ceftazidime, cefepime, cefepime/tazobactam, cefepime/zidebactam, ceftazidime/avibactam, and ceftolozane/tazobactam. Whole-genome sequencing revealed three of seven Klebsiella pneumoniae strains harbored blaSHV-1 only, and four harbored blaSHV-1 and blaTEM-1B. Two Escherichia coli strains carried blaTEM-1B only, while two Klebsiella oxytoca isolates harbored blaOXY-1-3 and blaOXY-1-1, respectively. No mutation in the β-lactamase gene and promoter sequence was found. Outer membrane protein (Omp) gene detection revealed that numerous missense mutations of OmpK36 and OmpK37 were found in all strains of K. pneumoniae. Numerous missense mutations of OmpK36 and OmpK35 and OmpK37 deficiency were found in one K. oxytoca strain, and no OmpK gene was found in the other. No Omp mutations were found in E. coli isolates. These results indicated that narrow spectrum β-lactamases, TEM-1, SHV-1, and OXY-1, alone or in combination with Omp mutation, contributed to the resistance to CSL and TZP in CRO-susceptible Enterobacteriaceae.

Antibiotic susceptibility tests

AntibioticsBreakpoint, (μg/ml)Klebsiella pneumoniae
Escherichia cou
Klebriehd axyoca
E1E3E4E7E9E10E11E6E8E2E5
CRO≤1≥4≤0.5≤0.5≤0.5≤0.5 1≤0.51≤0.5≤0.511
CAZ4 ≥161214444241 1
FEP≤2 216 110.2512220.521 1
AMC≤8 ≥32≥128≥128≥128≥128≥128≥128≥128≥128≥128≥128≥128
CSL≤16 ≥6464646464≥128128≥12864128128≥128
TZP≤16 ≥128≥256≥256≥256≥25622562256≥256≥256≥256≥256≥256
FPT≤2 ≥1610.50.060.1252120.2510.1250.25
FPZ≤2 2160.250.250.060.1250.250.25 10.1250.250.1250.125
CZA≤8 216 10.50.250.2510.2510.50.50.50.25
CZT≤2 28210.5 1222 1122

CROceftriaxone, CAZceftazidime, FEPcefepime, AMC:amoxicillin clavulanic-acid, CSLcefoperazone/sulbactam, TZP:piperadllin/tazobactam, FPT:cefepime tazobactam, FPZ:cefepime/zidebactam, CZA:ceftazidime/avibactam, CZTceftolozane/tazobactam

Gene sequencing results

NumberStrainSTp-Lactamase genePromoter sequence mutationOmp mutation
ElKpn45blaSHV-1, blaTEM-lBnoneOmpK36, OmpK3 7
E3Kpn45blaSHV-1, blaTEM-lBnoneOmpK36. OmpK3 7
E4Kpn2854blaSHV-1noneOmpK36, OmpK3 7
E7Kpn2358blaSHV-1 - blaTEM-lBnoneOmpK36, OmpK3 7
E9Kpn2358blaSHV-1. blaTEM-lBnoneOmpK36. OmpK3 7
E10Kpn 189blaSHV-1noneOmpK36. OmpK3 7
EllKpn45blaSHV-1noneOmpK36, OmpK3 7
E6Eco88blaTEM-lBnonenone
ESEco409blaTEM-1Bnonenone
E2Kox194blaOXY-1-3noneOmpK36 mutations. OmpK35 and OmpK 37 deficiency
E5Kox 11blaOXY-1-1noneno OmpK (OmpK3 5, OmpK36 and OmpK37) gene found

DOI: https://doi.org/10.33073/pjm-2022-023 | Journal eISSN: 2544-4646 | Journal ISSN: 1733-1331
Language: English
Page range: 251 - 256
Submitted on: Mar 8, 2022
Accepted on: Apr 30, 2022
Published on: Jun 19, 2022
Published by: Polish Society of Microbiologists
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2022 Fengzhen Yang, Qi Zhao, Lipeng Wang, Jinying Wu, Lihua Jiang, Li Sheng, Leyan Zhang, Zhaoping Xue, Maoli Yi, published by Polish Society of Microbiologists
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.