Abstract
Background
Biocides are frequently used as preservative, disinfectant and sterilizer against many microorganisms in hospitals, industry and home. However, the reduced susceptibility rate of Pseudomonas aeruginosa (P. aeruginosa) strains to biocides is increasing. The aim of this study was to evaluate the antimicrobial activity of four frequently used biocides against P. aeruginosa and to determine the prevalence of genes involved in biocide resistance.
Methods
A total of 76 clinical isolates of P. aeruginosa strains were used in the present study. The minimum inhibitory concentrations (MICs) of four biocides, i.e. chlorhexidine digluconate, benzalkonium chloride, triclosan and formaldehyde, against P. aeruginosa strains were determined using agar dilution method. In addition, the prevalence of biocide resistance genes was determined using the polymerase chain reaction (PCR) method.
Results
In the present study, the highest MIC90 and MIC95 (epidemiological cut-off) values were observed for benzalkonium chloride (1024 μg/mL), followed by formaldehyde (512 μg/mL), triclosan (512 μg/mL) and chlorhexidine digluconate (64 μg/mL). Furthermore, the prevalence of qacEΔ1, qacE, qacG, fabV, cepA and fabI genes were 73.7% (n = 56), 26.3% (n = 20), 11.8% (n = 9), 84.2% (n = 64), 81.5% (n = 62) and 0% (n = 0), respectively. A significant association was observed between the presence of biocide resistance genes and MICs (p < 0.05). Furthermore, there was no significant association between the presence of biocide resistance genes and antibiotic resistance (p > 0.05), except for levofloxacin and norfloxacin antibiotics and qacE and qacG genes (p < 0.05).
Conclusion
Our results revealed that chlorhexidine digluconate is the most effective biocide against P. aeruginosa isolates in Ardabil hospitals. However, we recommend continuous monitoring of the antimicrobial activity of biocides and the prevalence of biocide-associated resistance genes for a better prevention of microorganism dissemination and infection control in hospitals.
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Data availability
The data that support the findings of this study are available from the corresponding author on reasonable request.
Abbreviations
- MIC:
-
Minimum inhibitory concentration
- PCR:
-
Polymerase chain reaction
- P. aeruginosa :
-
Pseudomonas aeruginosa
- ICU:
-
Intensive care unit
- MDR:
-
Multi-drug resistant
- CLSI:
-
Clinical and Laboratory Standards Institute
- ECOFF:
-
Epidemiological cut-off value
- ENR:
-
Enoyl-acyl-carrier protein reductase
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Acknowledgements
The authors would like to acknowledge the Vice Chancellor for Research and Technology, Ardabil University of Medical Sciences, Ardabil, Iran, due to financial support.
Funding
This research was supported by Ardabil University of Medical Sciences, Iran (Grant Number: 1005761).
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MN, SS and SAB collected the data. FK and HV analyzed the data and led the writing of the manuscript. SH, MA and AS revised the manuscript.
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This research was approved by the Research Ethics Committee of Ardabil University of Medical Sciences.
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Namaki, M., Habibzadeh, S., Vaez, H. et al. Prevalence of resistance genes to biocides in antibiotic-resistant Pseudomonas aeruginosa clinical isolates. Mol Biol Rep 49, 2149–2155 (2022). https://doi.org/10.1007/s11033-021-07032-2
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DOI: https://doi.org/10.1007/s11033-021-07032-2