Medicine
One Health Approach to Antimicrobial Resistance
Quick fact
Antibiotic-resistant bacteria can transfer between animals and humans, and the same resistance genes are found in humans, livestock, and environmental water sources—underlining that tackling resistance cannot be done in one country or one species alone.
Why this is interesting
When you take antibiotics, where does the leftover medicine go? And what happens to the bacteria that survive? These questions lead to a surprising web that links your pill bottle to farm animals, rivers, and global health.
Read the full explanation
Understanding One Health Approach to Antimicrobial Resistance
Imagine a shared ecosystem where humans, animals, and the environment are all connected. When a human gets an infection, antibiotics kill most bacteria, but a few may survive and become resistant. These resistant bacteria, along with leftover antibiotics, are eventually excreted and enter sewage. Similarly, antibiotics are widely used in livestock to treat or prevent disease, and these drugs also end up in manure and wastewater. In the environment, resistant bacteria and antibiotics interact with natural bacterial communities, promoting the spread of resistance. The One Health approach recognizes that resistance does not respect species or environmental boundaries. To tackle it, we must coordinate efforts across human medicine, veterinary medicine, agriculture, and environmental management. It's like a multi-lane highway: resistance can travel from a farm to a human via food or environmental exposure, and from a hospital to the environment via wastewater. No single lane can be managed in isolation.
A deeper explanation
The underlying mechanism of the One Health approach is that antimicrobial resistance is driven by natural selection in every sector where antibiotics are used or released. Exposure to antibiotics in humans, animals, or the environment kills susceptible bacteria, allowing resistant ones to survive and multiply. Critically, resistance genes are often carried on mobile genetic elements, so they can spread horizontally between different bacterial species—including from animal-associated bacteria to human pathogens, and vice versa. The environment serves as a reservoir: antibiotic residues and resistant bacteria persist in soil, water, and wildlife, and can re-enter human and animal populations through contamination of produce, water, and direct contact. The One Health approach therefore calls for shared surveillance, coordinated stewardship of antibiotics in all sectors, and environmental monitoring to break the cycle. By linking data and strategies across disciplines, we can slow the emergence and spread of resistance globally.