Epidemiology and high incidence of Metallo-β-lactamase and AmpC-β-lactamases in nosocomial Pseudomonas aeruginosa

Document Type : Original Article

Authors

1 Institute of Molecular Biology & Biotechnology (IMBB), The University of Lahore, Defence road campus, Lahore, Pakistan

2 Department of Pathology, Combined Military Hospital, Lahore Cantt, Pakistan

3 Department of Respiratory Medicine, Tallaght University Hospital, Dublin, Ireland

4 M. Islam Medical College, Gujranwala, Pakistan

5 Al-Aleem Centre for Advanced Studies and Research, Gulab Devi Educational Complex, Lahore, Pakistan

Abstract

Objective(s): Isolates producing Metallo-β-lactamase (MBL) have a significant impact on therapeutic and diagnostic layouts, plus their increased frequency has been reported globally. Determination of incidence of clinical isolates of Pseudomonas aeruginosa that are capable of producing MBL and AmpC-β-lactamases making them resistant to imipenem and cefoxitin.
Materials and Methods: Out of 1159 collected samples of urine, wound swabs, blood, tissue, and pus, the isolation rate of P. aeruginosa in the period of March 2020 to February 2021 was 22.0% (255/1159). Bacterial strains that were resistant towards imipenem were further processed for detecting the β-lactamase group of genes followed by statistical analysis of risk factors done based on clinical sample, gender, plus department of sample collection.
Results: The percentage of resistance against imipenem was found to be 53%. Out of 135 strains, phenotypic tests revealed MBLs incidence to be 61.5% by combination disc test and 81.5% by Modified Hodge test (MHT). Frequencies of blaIMP-1, blaVIM, blaSHV, blaTEM, and blaOXA genes were calculated to be 13%, 15%, 32%, 43%, and 21%, respectively. Co-expressions of blaMBLs (blaVIM and blaIMP-1) plus blaESBL (blaSHV, blaOXA, blaTEM) were detected using simplex and multiplex PCR. blaTEM, blaSHV, and blaOXA co-existed in 7.5% of clinical isolates. 5.5% of the isolates exhibited simultaneous expression of MBL/ESBL genes. 15% of the isolates resistant to cefoxitin were positive for the blaAmpC gene (17/114).
Conclusion: This is a pioneer report from Pakistan that concomitantly presents expression of blaVIM and blaIMP-1 with blaTEM, blaOXA, blaSHV, and blaAmpC in isolates of P. aeruginosa.

Keywords

References

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Iranian Journal of Basic Medical Sciences
Volume 24, Issue 10
October 2021
Pages 1373-1379

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