Introduction
Carbapenem-resistant Escherichia coli (CREC) has emerged as a critical public health concern due to its resistance to last-resort antibiotics and its increasing detection outside hospital settings. The presence of CREC in retail meats represents a potential pathway for transmission of antimicrobial resistance from food-producing animals to humans. Understanding the occurrence, resistance mechanisms, and genetic characteristics of CREC in food sources is essential for risk assessment and the development of effective surveillance and control strategies, particularly in regions where antimicrobial use in animal production is common.
Prevalence of Carbapenem-Non-Susceptible E. coli in Retail Meats
The investigation demonstrated a high prevalence of presumptive carbapenem-non-susceptible E. coli (CNSEC) in retail meat samples, with beef showing the highest contamination rate. The large proportion of CNSEC isolates subsequently confirmed as CREC highlights retail meat as a significant reservoir of carbapenem-resistant bacteria. These findings suggest that the food chain may play an underrecognized role in the dissemination of carbapenem resistance, emphasizing the need for systematic monitoring of antimicrobial resistance in meat products.
Phenotypic Antimicrobial Resistance Profiles
Phenotypic susceptibility testing revealed that a substantial proportion of isolates exhibited resistance to both imipenem and meropenem, confirming their classification as CREC. The high level of resistance observed across different meat types underscores the limited therapeutic options available for infections caused by these strains. Such phenotypic resistance patterns also raise concerns about selective pressure from antimicrobial use in livestock, which may contribute to the maintenance and spread of highly resistant E. coli populations.
Molecular Detection of Carbapenemase Genes
Molecular analysis showed that only a small percentage of CREC isolates carried carbapenemase genes, predominantly the blaNDM gene, with one isolate also harboring blaVIM. Although the prevalence of these genes was low, their presence is alarming because blaNDM is associated with rapid global dissemination and high-level resistance. The detection of these genes in food-associated isolates indicates the potential for horizontal gene transfer and highlights the importance of molecular surveillance alongside phenotypic testing.
Virulence Factors and Phylogenetic Characteristics
All carbapenemase-positive CREC isolates carried the fimH gene, a key adhesion factor involved in colonization, but lacked other major virulence determinants. Phylogenetic analysis classified these isolates within Group D, which is often associated with extraintestinal pathogenic E. coli. This combination of antimicrobial resistance and phylogenetic background suggests that even isolates with limited virulence gene profiles may still pose a risk if they acquire additional pathogenic traits or are transmitted to vulnerable populations.
Public Health Implications and Research Perspectives
The identification of CREC carrying clinically important resistance genes in retail meats has significant implications for food safety and public health. These findings reinforce the need for a One Health approach integrating human, animal, and environmental surveillance of antimicrobial resistance. Future research should focus on tracking transmission pathways, assessing the role of food handling and preparation practices, and evaluating interventions to reduce the emergence and spread of carbapenem-resistant bacteria within the food supply chain.
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