When a food safety crisis erupts, the solution rarely lies in just one place. The outbreak might start in a farm, spread through a food processing plant, and ultimately affect human health. This interconnected reality is exactly what the One Health concept addresses. It recognizes a fundamental truth: the health of people, animals, and our shared environment are closely connected and interdependent.
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What is the One Health concept?
One Health represents a collaborative, multisectoral approach that works at local, regional, national, and global levels to achieve optimal health outcomes. It’s an integrated, unifying approach that aims to sustainably balance and optimize the health of people, animals, and ecosystems. While this concept isn’t entirely new, it has gained critical importance in recent years as human populations expand into new geographic areas, increasing contact with wild and domestic animals.
The approach emerged from growing evidence that many health threats cannot be solved by focusing on just one sector. Over the past three decades, approximately 75 percent of new human infectious diseases have been zoonotic, meaning they spread between animals and people. This reality demands a unified response involving disease detectives, laboratorians, physicians, veterinarians, ecologists, and policymakers working together.
The three interconnected pillars of One Health
The One Health framework rests on three fundamental pillars that function as an integrated system rather than separate entities.
Human health
Human health forms the visible endpoint of many disease cycles, but focusing solely on human illness means missing critical prevention opportunities. In food safety, this becomes especially clear when foodborne pathogens like Salmonella, Campylobacter, and Listeria cause millions of illnesses annually. Rather than only responding to human outbreaks retrospectively, the One Health approach shifts attention upstream to ecological, animal, and environmental sources where interventions can be most effective.
Animal health
Animals serve dual roles in the One Health framework. First, they can act as early warning systems for potential human health threats. Birds, for example, often die from West Nile virus before people in the same area develop symptoms. Second, the vast majority of zoonotic disease cases worldwide relate to animals bred for food purposes, making livestock health directly relevant to human food safety.
The global food system produces an estimated 30 billion food animals annually to feed the world’s population. This intensive production creates both opportunities and risks. When disease control measures focus on animal health at the source, they often prove more effective than attempting to manage problems downstream in the human population.
Environmental health
The environment connects human and animal health through multiple pathways. Climate change, deforestation, and intensive farming practices disrupt habitats and create new opportunities for diseases to emerge and spread. Contaminated water used for drinking, recreation, and agriculture can make both people and animals sick. Environmental factors also play a crucial role in antimicrobial resistance, as inadequately treated industrial, residential, and farm waste expands the reservoir of resistant organisms.
Why One Health matters in food safety
Food safety sits at the center of One Health concerns because it connects all three pillars directly and powerfully.
Zoonotic diseases and food chains
One of the major issues in food safety over recent decades has been the lack of cross-sectoral collaboration across the food production chain. Major food safety events, from BSE outbreaks to E. coli contaminations, have been significantly affected by insufficient collaboration between animal health, food control, and human health sectors.
The transmission routes for zoonotic pathogens through food are complex and dynamic. Consider how the Nipah virus, first identified in a disease outbreak that killed pigs and people in Malaysia, has more recently appeared as a contaminant in date palm sap in Bangladesh. Transmission vehicles can change when microbes are given new opportunities, demonstrating why continuous vigilance across sectors is essential.
The effectiveness of a One Health approach becomes clear when examining successful interventions. In some industrialized settings, diseases like Salmonella have been efficiently managed through farm-to-fork preventive action in the animal sector. Because many zoonoses originate in animals before transmitting to humans, the most effective intervention often occurs at the source rather than treating human cases after the fact.
Antimicrobial resistance
Antimicrobial resistance represents perhaps the clearest example of why One Health is essential. Resistant organisms can spread quickly through healthcare facilities, animals, food, and the environment, making treatment of certain infections more challenging and increasing the risk of severe illness and death.
The indiscriminate use of antimicrobials in the veterinary field has led to the emergence of resistant bacteria that cause infections in humans, particularly in species like Enterococcus, Campylobacter, Salmonella, and E. coli. When animals receive antimicrobials for therapeutic or growth-promoting purposes, resistant strains can develop and transfer to humans through food consumption or direct contact.
The problem extends beyond just animal agriculture. Antimicrobials administered to both people and animals eventually enter the environment through waste streams, potentially creating reservoirs for resistant organisms. This reality means that antimicrobial stewardship must be practiced across all sectors simultaneously to be effective.
Implementing One Health strategies
Translating the One Health concept into practice requires specific mechanisms and actions. The foundation of One Health rests on communication, coordination, and collaboration among human, animal, environmental health partners, and other relevant players.
Successful implementation involves several key components. First, establishing formal multisectoral coordination mechanisms that create pathways for information sharing and joint decision-making across sectors. Second, developing integrated surveillance systems that detect threats early by monitoring disease patterns in humans, animals, and the environment simultaneously. Third, building laboratory capacity that allows for cross-sectoral testing and data sharing.
The approach has demonstrated tangible benefits. Networks like PulseNet, which connects food, animal, and public health laboratories, are estimated to have prevented 270,000 foodborne illnesses and saved $507 million annually through rapid cluster identification.
Countries implementing One Health approaches have seen measurable improvements in preventing zoonotic disease outbreaks, improving food safety and security, reducing antimicrobial-resistant infections, and protecting global health security. The approach enables proactive prevention rather than reactive response, targeting interventions where they can have the greatest impact.
Looking forward, the COVID-19 pandemic has underscored the critical importance of strengthening One Health approaches. The emergence of SARS-CoV-2 highlighted how pathogens can jump from animals to humans with devastating consequences, and how environmental factors influence disease transmission. This experience has renewed commitment to building more resilient and equitable systems through integrated, cross-sectoral collaboration.
What do you think? How might your organization or community benefit from adopting a One Health approach to address food safety challenges? What barriers currently prevent better collaboration between human health, animal health, and environmental sectors in your area?
References
- https://www.cdc.gov/one-health/about/index.html
- https://www.who.int/health-topics/one-health
- https://pmc.ncbi.nlm.nih.gov/articles/PMC7121645/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC7121890/
- https://www.ncbi.nlm.nih.gov/books/NBK114498/
- https://www.who.int/europe/publications/i/item/WHO-EURO-2024-9510-49282-73655
- https://pmc.ncbi.nlm.nih.gov/articles/PMC9047147/
- https://www.nature.com/articles/s41598-022-12619-1
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