Prevalence of the colistin resistance gene <i>MCR-1</i> in colistin-resistant <i>Klebsiella pneumoniae</i> in Egypt

Rania Abozahra; Amal Gaballah; Sarah M. Abdelhamid; Rania Abozahra; Amal Gaballah; Sarah M. Abdelhamid

doi:10.3934/microbiol.2023011

AIMS Microbiology

2023, Volume 9, Issue 2: 177-194. doi: 10.3934/microbiol.2023011

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Research article

Prevalence of the colistin resistance gene MCR-1 in colistin-resistant Klebsiella pneumoniae in Egypt

Department of Microbiology and Immunology, Faculty of Pharmacy, Damanhour University, Damanhour, Egypt

Received: 09 December 2022 Revised: 16 February 2023 Accepted: 22 February 2023 Published: 01 March 2023

Klebsiella pneumoniae is a nosocomial pathogen with high morbidity and mortality rates in hospitalized patients. The emergence of multidrug-resistant K. pneumoniae has become more challenging to treat, with the prevalence of colistin-resistance. Therefore, reliable methods for detecting colistin resistance are required. Many plants' essential oils have antimicrobial activity and have been used to combat multiple antibiotic resistances. This study aimed to investigate the characterization and prevalence of the colistin resistance gene mcr-1 in K. pneumoniae in Egypt, evaluate rapid polymyxin NP test, determine the transferability of mcr-1 gene, and study the synergistic activity of eugenol combined with colistin against K. pneumoniae isolates. Eighty-two K. pneumonia isolates were collected from different human samples, followed by antibiotic susceptibility testing, rapid polymyxin NP test, and detection of the mcr-1 gene and its transfer frequency. Determination of the MICs of colistin alone and in combination with eugenol was performed, then mcr-1 gene expression was determined in the presence of eugenol. Thirty-two isolates (39%) were colistin-resistant. Rapid polymyxin NP test failed to detect resistant isolates with MICs below 32 µg/mL. Detection of mcr-1 gene was made in 27 (84%) of colistin resistant isolates. The rest isolates possess alteration in the mgrB gene which probably causes colistin resistance. The mcr-1 gene was transferred by conjugation to other sensitive isolates. MIC of eugenol ranged from 416 to 1664 µg/mL, and FICI ranged from 0.265 to 0.75. Results also revealed suppression of mcr-1 gene expression in the presence of sub MIC of eugenol. Our results demonstrated a high prevalence of mcr-1 in Egypt and its ability to transfer to other strains. Difficult determination of colistin-resistant isolates with low values with rapid polymyxin NP test was apparent. Eugenol exerted a synergistic effect with colistin and improved its antimicrobial activity.
- Klebsiella pneumoniae,
- colistin resistance,
- mcr-1 gene,
- rapid polymyxin NP test,
- transferability,
- eugenol
Citation: Rania Abozahra, Amal Gaballah, Sarah M. Abdelhamid. Prevalence of the colistin resistance gene MCR-1 in colistin-resistant Klebsiella pneumoniae in Egypt[J]. AIMS Microbiology, 2023, 9(2): 177-194. doi: 10.3934/microbiol.2023011

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Abstract

Klebsiella pneumoniae is a nosocomial pathogen with high morbidity and mortality rates in hospitalized patients. The emergence of multidrug-resistant K. pneumoniae has become more challenging to treat, with the prevalence of colistin-resistance. Therefore, reliable methods for detecting colistin resistance are required. Many plants' essential oils have antimicrobial activity and have been used to combat multiple antibiotic resistances. This study aimed to investigate the characterization and prevalence of the colistin resistance gene mcr-1 in K. pneumoniae in Egypt, evaluate rapid polymyxin NP test, determine the transferability of mcr-1 gene, and study the synergistic activity of eugenol combined with colistin against K. pneumoniae isolates. Eighty-two K. pneumonia isolates were collected from different human samples, followed by antibiotic susceptibility testing, rapid polymyxin NP test, and detection of the mcr-1 gene and its transfer frequency. Determination of the MICs of colistin alone and in combination with eugenol was performed, then mcr-1 gene expression was determined in the presence of eugenol. Thirty-two isolates (39%) were colistin-resistant. Rapid polymyxin NP test failed to detect resistant isolates with MICs below 32 µg/mL. Detection of mcr-1 gene was made in 27 (84%) of colistin resistant isolates. The rest isolates possess alteration in the mgrB gene which probably causes colistin resistance. The mcr-1 gene was transferred by conjugation to other sensitive isolates. MIC of eugenol ranged from 416 to 1664 µg/mL, and FICI ranged from 0.265 to 0.75. Results also revealed suppression of mcr-1 gene expression in the presence of sub MIC of eugenol. Our results demonstrated a high prevalence of mcr-1 in Egypt and its ability to transfer to other strains. Difficult determination of colistin-resistant isolates with low values with rapid polymyxin NP test was apparent. Eugenol exerted a synergistic effect with colistin and improved its antimicrobial activity.

Conflicts of interest

The authors declare that they have no conflict of interest.

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