One Health

The “One Health” approach summarises a concept that has been known for more than a century; that human, animal and plant health are interdependent and bound to the health of the ecosystems in which they exist. We envisage and implement it as a collaborative, whole of society, whole of government approach to understanding, anticipating and addressing risks to global health.

One Health

Global health risks and tomorrow’s challenges

The COVID-19 pandemic, a human public health crisis resulting from a virus of potential animal origin, underlined the validity of the One Health concept in understanding and confronting global health risks. Often used to coordinate multi-sectoral prevention, preparedness and response efforts of zoonotic diseases (those that may transmit from animals to humans, or humans to animals), this approach is critical for the control of priority zoonotic diseases such as rabies, avian flu or viral haemorrhagic fevers such as Ebola. Furthermore, numerous cross-cutting issues, such as antimicrobial resistance, food safety, climate change and weak health care infrastructure, need to be addressed from a multisectoral and multidisciplinary perspective, which the One Health approach guarantees. 

A visual concept of the One Health approach

Health risks are increasing. Drivers such as changes in climate and land-use, unsustainable agricultural practices, globalisation, and the wildlife trade, provide multiple opportunities for pathogens to evolve into new forms, making spillover events from animals to humans more frequent and intense. And the risk is not only for humans. While most risk assessments focus on the transmission of pathogens from animals to humans, diseases can also pass from humans to animals, and generate great impacts on the health of animals, whether domestic or wild. COVID-19, tuberculosis, influenza, among others, can infect or be fatal to different species of animals. Gorillas and chimpanzees, with their close genetic makeup to humans, are particularly susceptible to human diseases. Similarly, to other endangered species, they should be handled with care by Veterinary Services, wildlife authorities and researchers. 

Managing these major global health risks is not possible alone.  It requires the full cooperation of the animal, human, plant and environmental health sectors. The World Organisation for Animal Health (WOAH) brings its expertise in animal health and welfare to the much needed multisectoral partnerships. Together, we aim to develop global strategies to tackle major diseases or broader health threats, such as antimicrobial resistance. 

Throughout the Organisation’s work, we promote the One Health approach, recognising the interdependence of animal, human and environmental health. Because the health of animals and of the environment strongly depend on human activities and our relationship with nature. Because the health of animals and the environment also determine human health. 

“It’s everyone’s health. Together, we can find concrete solutions for a healthier, and more sustainable world.”   

Dr Monique Éloit, Director General 

One Health facts

World health 


of pathogens that cause human diseases originate from domestic animals or wildlife.


of emerging infectious human diseases have an animal origin.


of pathogens that are of bioterrorism concern originate in animals.

Food security

Each night, some


people go to bed hungry. 

More than


additional animal protein will be needed to feed the world by 20501

Meanwhile, more than


of global animal production losses are linked to animal diseases. 


One Health includes environmental issues

Humans and their livestock are more likely to encounter wildlife when more than 25% of an original forest cover is lost. Some of these contacts may increase the likelihood of disease transmission. 

Humans have altered terrestrial and marine environments and are integral to the One Health approach

Human actions have severely altered 75% of terrestrial environments and 66% of marine environments. 


Animal diseases pose a direct threat to the incomes of rural communities that depend on livestock production. 

The One Health approach also looks to improve economic conditions for people in the farming industry

More than 75%2 of the billion people who live on less than $2 per day depend on subsistence farming and raising livestock to survive. 

[1] FAO, 2011. World Livestock 2011 – Livestock in the food security.
[2] FAO \& WOAH/OIE, 2015. Global control and eradication of peste des petits ruminants Investing in veterinary systems, food security and poverty alleviation

Collaborating for better global health

The World Organisation for Animal Health (WOAH) has been at the forefront of controlling animal diseases and ensuring animal health and welfare for almost 100 years.  Recognising that no single organisation can tackle the complex challenges of global health on its own, we promote collaborations and advocate for greater global health governance that covers all aspects of animal, human and ecosystem health. 

Building this governance has taken the shape of a Quadripartite Alliance between WOAH, the Food and Agriculture Organization of the United Nations (FAO), the UN Environment Programme (UNEP) and the World Health Organization (WHO). This collaboration helps countries prevent and control global health risks such as antimicrobial resistance and emerging diseases. 

“Using a One Health lens that brings all relevant sectors together is critical to tackle global health threats, like monkeypox, COVID-19 and Ebola. It all starts with ensuring the health of animals. Animal health is our health, it is everyone’s health.” 

Dr Monique Éloit, Director General 

Acting for One Health

The work of the One Health Quadripartite Alliance is outlined in the One Health Joint Plan of Action that was developed in 2022. This plan provides a framework of action and set of activities that aim to strengthen collaboration, communication, capacity building and coordination. It also guides the implementation of these activities across all sectors responsible for addressing health concerns at the human-animal-plant-environment interface. 

This framework is informed by evidence, best practices, and existing guidance. It is designed for countries, international partners, and non-State actors such as civil society organizations, professional associations, academia and research institutions for their One Health planning and implementation. 

It is built around six interdependent Action Tracks that collectively contribute to achieving sustainable health and food systems, reduced global health threats and improved ecosystem management by: 

Enhancing countries’ capacity to strengthen health systems under a One Health approach

Reducing the risks from emerging or resurfacing zoonotic epidemics and pandemics 

Controlling and eliminating endemic zoonotic, neglected tropical or vector-borne diseases 

Strengthening the assessment, management and communication of food safety risks 

Curbing the silent pandemic of antimicrobial resistance (AMR)  

Better integrating the environment into the One Health approach 

The One Health High-Level Expert Panel

The heads of FAO, UNEP, WHO and WOAH met in November 2020 at the Paris Peace Forum and decided to enhance their cross-sectoral collaboration by creating a multidisciplinary One Health High-Level Expert Panel (OHHLEP).  

From over 700 applications received, 26 international experts were appointed in May 2021 to serve as members on the OHHLEP. The Panel is multidisciplinary, with experts who have a range of technical knowledge, skills and experience relevant to advance the One Health agenda. It has an important scientific advisory role to the Quadripartite organisations and is expected to provide evidence-based scientific and policy advice to address One Health challenges.  

Key first product of the Expert Panel is the development of a comprehensive definition of ‘One Health’. The new definition better explains how sectors, disciplines and society connect as a whole to the One Health concept through four main pillars: communication, collaboration, coordination, and capacity building. In this context, WOAH advocates to consolidate the vital role of animal health within the context of global health issues and promote collaboration between animal, public health, and environmental sectors.

OHHLEP’s definition of One Health

One Health is an integrated, unifying approach that aims to sustainably balance and optimize the health of people, animals and ecosystems. It recognises the health of humans, domestic and wild animals, plants, and the wider environment (including ecosystems) are closely linked and inter-dependent. The approach mobilises multiple sectors, disciplines and communities at varying levels of society to work together to foster well-being and tackle threats to health and ecosystems, while addressing the collective need for clean water, energy and air, safe and nutritious food, taking action on climate change, and contributing to sustainable development. 

A stronger multi-sectoral collaboration
at global level throughout the years

2022 – A new One Health era 

  • The Tripartite Alliance for One Health formally became the Quadripartite Alliance. FAO, WHO and WOAH signed a Memorandum of Understanding with the United Nations Environment Programme (UNEP) to better integrate the environmental sector in the One Health approach.   

2018 – A boosted collaboration 

  • Soon after, we agreed to strengthen our long-standing partnership on antimicrobial resistance through a new Memorandum of Understanding
  • The agreement improved disease forecasting capabilities, helped countries strengthen their national health systems, and programmed joint activities related to reduction of threats. 

2017 – An increased commitment 

  • Reaffirming our commitment to provide collaborative leadership in addressing health challenges, we released an updated Tripartite strategy
  • Our priorities were enlarged to also cover the reinforcement of national health services, the modernisation of early warning and surveillance systems, and the promotion of coordinated research, among other activities. 

2011 – Establishment of priority areas 

To advance the One Health approach, the Tripartite Alliance decided on 3 priority areas of work: antimicrobial resistance, avian influenza and rabies. 

2010 – An official Tripartite collaboration 

  • After decades of collaboration between WOAH, FAO and WHO, we formalised our work through a Tripartite Alliance. 
  • We published a Tripartite Concept Note describing our joint goals and coordination mechanisms to address One Health challenges. 

One Health, beyond the concept

The One Health approach is a tangible and sustainable way to make the world safer for everyone. Through different initiatives, we collaborate with our partners to put this vision into practice by polling efforts and knowledge from different sectors.  

A multi-sectoral approach is crucial in the One Health approach to addressing AMR

A multi-sectoral approach to address antimicrobial resistance

Antimicrobial resistance (AMR) is a threat to humans, animals, plants and the environment. It affects us all. To curb it effectively, all sectors must join forces and encourage the responsible use of antimicrobials, as well as preventive measures. 

In collaboration with our Quadripartite partners (FAO, UNEP, WHO), we mobilise resources and action to fight this silent pandemic that threatens the lives of millions.  

Reducing the risk of emerging and neglected zoonotic diseases

One Health is much more than a mere concept: it also provides the best path towards tackling many zoonotic diseases.  

Rabies is one of these diseases. The United Against Rabies Forum led by WOAH, FAO and WHO provides an example of One Health in action. In order to end human deaths caused by dog-mediated rabies by 2030, the forum coordinates more than 30 institutions, through three main working groups. 

Reducing the risk of emerging and neglected zoonotic diseases

Influenza is another zoonotic disease that requires a One Health approach. Since 2005, we have been coordinating with FAO a network of expertise on animal influenza (OFFLU). OFFLU also collaborates with WHO for pandemic preparedness by providing data on zoonotic animal influenza. This partnership led to the production of diagnostic protocols needed to inform surveillance and control policies and build technical partnerships with national laboratories. 

Scaling up our efforts for wildlife health 

Collaborations between human and animal health services have not always integrated the wildlife sector, ignoring an important component of the chain of disease surveillance. The health of wildlife is deeply intertwined with the health of other animals, the environment and even humans. By protecting wildlife health, we safeguard biodiversity- and invest in a healthier, more sustainable future. In the light of recent emerging diseases such as Ebola or COVID-19, the role of wildlife, wildlife trade, and ecosystem health can no longer be overlooked. This is why WOAH works with a multitude of partners to better wildlife health on several key issues.  

Reinforcing disease intelligence

Early warning is critical to mitigate potential health threats at the human-animal-environment interface, supported by robust risk assessments to inform decisions, actions, and communications across sectors. GLEWS is a global platform developed jointly with our partners to advise on prevention and control measures after the detection of health threats or events of potential concern at the human-animal-ecosystems interface. 

Towards a pandemic instrument 

The COVID-19 crisis has made it painfully clear: the world needs a global strategy on pandemic prevention, preparedness, and response. Global leaders have united, in 2021, in an urgent call for an international pandemic instrument that would protect our planet from future health crises. We carry the voice of animal health through our participation in the negotiation process led by the Intergovernmental Negotiating Body (INB), coordinated by WHO, in support of the development of a new pandemic instrument that guarantees political commitment for strengthening global collaboration on pandemic prevention. 

Strengthening the One Health collaboration in the field 

Strong and resilient health governance systems are also needed at national level to ensure effective multi-sectorial coordination when addressing common health risks. However, some countries still lack consultation and collaboration mechanisms across their different health sectors. 

The initiatives presented below aim at assisting countries in setting up effective national health systems that are well organised and operate according to the principles of good governance and One Health. 

Training health professionals on One Health

We are committed to support the sustainable improvement of the capacities of national Veterinary Services. That is why we have partnered with the World Health Organization (WHO) to develop joint One Health training programmes. Key first steps of this initiative included the roll-out of multi-sectorial national seminars in countries aimed at strengthening collaboration between their human and animal health sectors. These seminars provide participants from national authorities with countless opportunities to improve dialogue, coordination and collaboration across sectors.  

A dedicated WHO/WOAH working group has also been created to focus specifically on networking in order to build a global One Health learning community that shares common values. Our joint trainings aim to be the starting point of a long history of cooperation to build communities where Members can learn over time but also from each other. 

  • One Health Capacity Building

    One Health capacity building

    Intersectoral collaboration is essential for managing health risks at the animal−human interface. Organised in partnership with the World Health Organization (WHO) and the Food and Agriculture Organization of the United Nations (FAO), the National Bridging Workshops aim to foster One Health capacity building and planning at national level, by creating synergies between the animal health and human health sectors.

Developing capacities to manage zoonotic disease risks 

Achieving sustainable and functional collaboration among all the sectors responsible for health is a crucial step to addressing the challenges posed by zoonoses. To this end, we have jointly developed the guide: Taking a Multisectoral, One Health Approach: A Tripartite Guide to Addressing Zoonotic Diseases in Countries with the UN Food and Agriculture Organization (FAO) and WHO. This guide is flexible enough to be used for other health threats at the human-animal-environment interface beyond zoonoses; for example, for food safety and antimicrobial resistance (AMR). It provides principles, best practices and options to assist countries in the prevention, preparedness, detection and response to zoonotic threats. Examples and lessons learned from countries experiences are also included. 

To complement the guide, an online training and operational tools have been developed providing practical guidance for strengthening a One Health approach to zoonotic diseases. Discover the publications below: 

Reinforcing surveillance systems

Surveillance protocols are essential to early detect health risks. By sharing this information, decisions could be made on a timely manner to reduce the risk of disease spread between animals and humans. To strengthen early detection systems for the Ebola virus as well as four other viral haemorrhagic fevers, we have been implementing the EBO-SURSY Project in West and Central Africa in collaboration with the French Agricultural Research Centre for International Development (CIRAD), French National Research Institute for Sustainable Development (IRD), and the Institut Pasteur.  

Through this project funded by the European Union, actors from across different sectors, including conservationists, forestry services, national Veterinary Services, epidemiologists and data managers, were trained to rapidly respond after the detection of dead or sick wild animals. The tracking and sampling of migrating bats during the project also showed how the animals are capable of transmitting pathogens across long distances, and could help predict future outbreaks. 

Providing guidance for One Health field epidemiology training programmes

Field epidemiology is the application of epidemiological knowledge, skills and competencies in surveillance of and response to urgent health challenges. Field Epidemiology Training Programs (FETP) – available for public health, veterinary public health, and laboratories – have been critical to developing these capacities since the establishment of the first one in 1951 by the US Centers for Disease Control and Prevention. As of 20231, there were 98 active FETPs supporting over 165 countries.  

FAO, WHO, and WOAH developed the Competencies for One Health Field Epidemiology (COHFE) framework and training guidance to support these programmes in incorporating the One Health approach. While the framework outlines the knowledge, skills, and competencies required for field epidemiologists to implement the One Health approach across 14 domains, the training guidance documents offer further direction and complement it. 


Policy Briefs

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You work in the animal, human, plant or environmental health sector, check our technical resources

Quadripartite publications 

Global initiatives

  • Antimicrobial resistance

    Antimicrobial resistance

    Imagine a world where infections and diseases in humans, animals and plants are impossible to treat. This worst-case scenario could become a reality as bacteria, viruses and parasites develop resistance to the drugs we use to fight them. Antimicrobial resistance, or AMR, has become one of the most pressing health issues of our time. Solutions exist and everyone has a role to play in the fight against this global threat.
  • Food Safety

    Food Safety

    Unsafe food containing harmful bacteria, viruses, parasites or chemical substances, causes more than 200 diseases. Diarrhoeal diseases are the most common illnesses resulting from the consumption of contaminated food, causing 550 million people to fall ill and 230 000 deaths every year. According to the World Health Organization (WHO), every year about 600 million – almost 1 in 10 people in the world – fall ill after eating contaminated food; and more than 400,000 die every year because of food borne diseases.
  • Wildlife Health

    Wildlife co-exists alongside humans and domestic animals. Wildlife populates ecosystems across the planet, whether it be in the seas, or roaming freely across forests and savannahs. Each species contributes to the balance of the ecosystem they live in. The health of wildlife is deeply entwined with the health of other animals, the environment and even humans. By protecting wildlife health, we safeguard biodiversity- and invest in a healthier, more sustainable future.


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Mature veterinarian in white coat and protective mask on face holding clipboard and using smart phone while standing in cote. In background pigs.

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