Frequencies of mobilized colistin resistance (mcr-1, 2) genes in clinically isolated Escherichia coli; a cross sectional study

• Published in: BMC research notes Vol. 16; no. 1; pp. 1 - 192
• Main Authors: Mirzaei, Bahman, Ebrahimi, Aida, Hariri, Bahareh, Sokouti, Zahra, Kazemi, Niloufar, Moradi, Narges
• Format: Journal Article
• Language: English
• Published: London BioMed Central Ltd 31.08.2023; BioMed Central; BMC
• Subjects: Acids; Ampicillin; Analysis; Antibacterial agents; Antibiotic resistance; Antibiotic resistant; Antibiotics; Antimicrobial resistance; Bacteria; Beta lactamases; Biofilms; Colistin; Cross-sectional studies; Dosage and administration; Drug resistance; Drug resistance in microorganisms; E coli; Escherichia coli; Eshershia coli; Genes; Genetic aspects; Genetic research; Gram-negative bacterial infections; Infections; Minimum inhibitory concentration; Motility; Multidrug resistance; Phenotypes; Prevention; Research Note; Risk factors; Stains & staining; Statistical analysis; Sulbactam; Sulfamethoxazole; Surveys; Tetracycline; Tetracyclines; Trimethoprim; β Lactamase; Finland; United Kingdom > UK; Germany
• ISSN: 1756-0500; 1756-0500
• DOI: 10.1186/s13104-023-06455-3

Escherichia coli (E. coli) is an opportunistic bacterium, which is globally recognized for its high prevalence and antimicrobial resistance (AMR). The presence of colistin-resistant representative mcr- 1, 2 genes in multi-drug resistant (MDR) clinically isolated E. coli is the main goal of this survey. After biochemically and molecular confirmation tests, susceptibility testing, biofilm formation, and minimum inhibitory concentration to colistin were performed on 100 E. coli isolates. Subsequently, taking advantage of uniplex-PCR, the presence of some responsible genes (mcr- 1, mcr- 2) to colistin-resistant phenotypes in mentioned bacterium was assessed. Disc diffusion methods indicated that the highest resistance rate was against ampicillin (80.0%), and trimethoprim/sulfamethoxazole (63%). Among the E. coli isolates, 72 (72.0%) was determined as MDR, respectively. Moreover, 47 (47%) strains were determined as extreme beta-lactamase (ESBL) phenotypes. Among 41 slime-producing E. coli strains, 7 (17.07%), 14 (34.14%), and 20 (48.78%) strains exhibited high, moderate, and weak levels of biofilm formation, respectively. Fifty-nine (81.94%), and 1(100%) of MDR isolates were assessed as colistin resistant (MIC > 2) and susceptible (MIC [less than or equal to] 2) as well. In 26(36.11%) of colistin-resistant isolates and 1(1.38%) of colistin, susceptible isolate mcr-1 gene was found. There is no mcr- 2 gene was detected in isolates. The diversity of high antibiotic-resistant rates could be avoided by developing appropriate healthcare policies and community awareness. Alarming resistance rates were observed in colistin and ampicillin, which should be taken into account in therapy guidelines.