General information, not a diagnosis Method and limitations

FolderUnderstanding and preventing

One Health: linking human, animal and environmental health

Human health depends on the health of animals, plants and ecosystems. The One Health approach links trades and data to detect risks early, choose appropriate measures and avoid each sector working in isolation.

Topic updated:

Veterinarian, environmental specialist and health professional exchanging near a wetland
AI-generated illustration, not evidence of a health event. Field data become more meaningful when compared between sectors and interpreted locally.

EssentialShort answer

To be retained

The starting points

One Health is a method of cooperation between human health, animal health, plant health and the environment. It includes understanding zoonoses, antimicrobial resistance, food safety, and the effects of environmental change. She does not claim that an isolated signal is announcing an epidemic.

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01Reference

Four eyes on the same event

A biological signal may appear in several media. Each source describes a part of the problem; their rapprochement helps to formulate the right questions.

Human monitoring

Health professionals and laboratories describe the symptoms, diagnoses, hospitalizations and affected groups.

Animal and plant health

Veterinary and phytosanitary services monitor species, livestock, wildlife, crops and movements of animals or products.

Media and exhibitions

Water, soil, vectors, land uses and working conditions change the possibilities of exposure.

Public decision

The authorities cross-reference the data and their uncertainties before defining measures proportionate to the territory.

02Reference

When this approach is useful

Cooperation is particularly useful when only one source is not sufficient to understand the transmission or effects of a measure.

Zoonoses

Compare human and animal observations, then specify actual contacts before assigning a source.

Antimicrobial resistance

Follow the use and resistance in human medicine, veterinary, agriculture and the environment.

Water and food

Link media quality, production, distribution and documented human cases.

Vectors

To compare observed mosquitoes or ticks, climate, movements and confirmed cases.

03Reference

Play a signal without overinterpretation

The presence of an agent in the environment alone does not demonstrate transmission to humans.

Check the measurement

What method was used? What period? Has a result been confirmed?

Specify the exposure

Who can be exposed, how long, and with what protections?

Compare series

A consistent and repeated trend is more informative than an isolated point.

Follow the competent authority

Operational guidelines are issued by public health, veterinary services or local authorities depending on the subject.

LandPutting into context

Situations to be considered

These examples show when the data cross-check provides additional information.

A disease occurs in animals

Compare veterinary observations, documented human contacts and breeding conditions before concluding that there is a risk to the population.

A signal is detected in the water

Identify the sampling method, water uses and local health data; detection alone does not prove human exposure.

A vector is gaining ground

To compare the presence of the vector, the circulation of an agent, the movements and confirmed cases in the territory.

In practiceObserve and understand

Follow an alert across people, animals and environments

One Health connects the health of people, animals, plants and ecosystems. An alert becomes more informative when sectors jointly describe the locations, dates and methods of their observations.

  1. Observe

    Describe an event in its context.

  2. Cross-check

    Compare information from the sectors concerned.

  3. Take action

    Coordinate prevention and surveillance.

  4. Reassess

    Check effects and new observations.

Follow an alert across people, animals and environments — explanations and limits
Example questionInformation to connectWhat remains to establish
Cases occur near a livestock farm.Dates, contacts, human and veterinary results.Proximity alone does not demonstrate transmission.
A pathogen is detected in water.Sampling site, water uses and health observations.Detection does not prove an infectious exposure.
Vectors are observed.Species, season, surveillance and pathogen circulation.A vector’s presence does not mean every bite causes infection.
Keep in mind

Connecting data helps formulate a hypothesis; it still needs testing. Coincidence in place or time is not enough to establish a cause.

References for these explanations

Sources consulted on . Examples and diagrams are educational; the original guidance defines its scope.

QuestionsClarifications

Frequently Asked Questions

Does One Health only concern zoonoses?

No. The approach also covers antibiotic resistance, food security, water, plant health and the health effects of ecosystems.

Does a positive result in the environment mean an immediate danger?

Not necessarily. The method, agent, possible route of exposure, quantity, signal repeat and available human or animal data must be checked.

Who decides what measures to take in a One Health approach?

Competent authorities according to field and territory. Cooperation informs their decisions; it does not replace the field survey or the regulatory powers of each department.

Why follow plants too?

Crops and ecosystems influence food resources, antimicrobial uses, and interactions between humans, animals, and media.

Institutional sources

External sources can evolve. Check their date and instructions for your territory.

PratiqueCheck before deciding

Croiser des données sans confondre les périmètres

Reading guidance and interpretation limits
Concept or situationWhat it describesPoint to watch
Human healthCas, consultations ou résultats de tests chez des personnes.Définition de cas, accès aux soins et territoire de résidence.
Animal healthInfections ou mortalités dans une population animale.Espèce, élevage ou faune sauvage, méthode et couverture de surveillance.
MilieuDétection dans l’eau, le sol ou les vecteurs.Méthode, viabilité éventuelle de l’agent et possibilité réelle d’exposition.