Intestinal colonization of weaner pigs by extended-spectrum-β-lactamase-encoding Escherichia coli classified for differential host-association using a phylogenetics-based approach

The Quick Summary

Germs, called bacteria, live inside animals and people, and some of these bacteria can become very strong and hard to kill with medicine. One type, named Escherichia coli (or E. coli), is especially good at spreading these strong traits, making them resistant to many medicines. Scientists wanted to learn if certain E. coli prefer to live only in particular animals, like pigs or chickens, or if they can easily move between different animals and people. They studied over a thousand E. coli from cows, chickens, people, and pigs collected from several countries. They used special computer tools to figure out which animals each E. coli liked to call home. This helps us understand how these strong E. coli germs travel and how to stop them from making us sick, especially focusing on how they colonize pigs.

Practical Implications

Understanding the host-association of antimicrobial-resistant (AMR) Escherichia coli (E. coli) is crucial for food safety. If AMR E. coli lineages are not strictly host-specific, they can readily transfer from livestock, such as pigs, chickens, and cattle, to humans, often via the food chain through contaminated food products. This knowledge allows food scientists to identify critical control points throughout food production, from farm to fork. For instance, if E. coli colonizing weaner pigs can easily jump to other hosts or contaminate meat during slaughter and processing, targeted interventions on farms and during processing are vital to reduce the risk of transmitting these resistant bacteria to consumers. Implementing stringent hygiene practices in agricultural settings, particularly in animal husbandry, and in food processing facilities becomes paramount to mitigate the spread of AMR E. coli and safeguard public health.

Potential Use in Indonesia

In Indonesia, with its vibrant traditional markets and ubiquitous street food vendors, understanding how AMR E. coli jump between hosts is highly relevant. If these bacteria easily move from live animals, like those sold in markets, to other foods or humans, the tropical climate and often less controlled hygiene can accelerate their spread. This highlights the urgent need for improved sanitation, safe handling practices for both raw and cooked foods, and effective waste management within Indonesia’s diverse and sometimes informal food supply chains to protect public health.

Original Abstract

Intestinal bacteria in healthy humans and animals are important reservoirs of antimicrobial resistance (AMR) genes. Certain Escherichia coli lineages dominate the global spread of AMR, but the extent of their host specificity and its impact on transmission remains unclear. Here, 1,198 E. coli isolates from cattle, chickens, humans, and pigs across Germany, the UK, Spain, and Vietnam were classified for host-association using a phylogeny-based bioinformatic approach, with non-host-associated……

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