Zoonotic Diseases: Can One Health Help Prevent

Why is One Health part of pandemic prevention?

Preventing the next pandemic requires attention to events outside hospitals. In its May 10, 2024 update on pandemic-agreement negotiations, WHO identified prevention and One Health among the issues under discussion. That announcement was an earlier milestone, rather than a new development this October, but it highlighted an enduring scientific concern: threats to human health can emerge through interactions with animals and their environments. [WHO negotiation update](https://www.who.int/news/item/10-05-2024-governments-agree-to-continue-their-steady-progress-on-proposed-pandemic-agreement-ahead-of-the-world-health-assembly).

A subsequent development gives that approach a longer implementation horizon. On August 14, 2026, the World Organisation for Animal Health announced that the four partner organizations had extended their One Health Joint Plan of Action through 2029. Those partners are WHO, the Food and Agriculture Organization, the United Nations Environment Programme and the World Organisation for Animal Health. The extension supports continued planning and coordination, alongside a review of implementation experience; it is not itself evidence of a measured reduction in pandemic risk. [One Health plan extension](https://www.woah.org/en/quadripartite-collaboration-extends-the-one-health-joint-plan-of-action-to-2029/).

How can animal and environmental monitoring reveal emerging infections?

The CDC reports estimates that more than 60% of known human infectious diseases can spread from animals, while approximately 75% of new or emerging human infectious diseases originate in animals. These figures describe categories of diseases, not the proportion of individual patients infected through animal contact. Zoonotic infections can reach people through direct contact, contaminated food or water, or vectors such as mosquitoes and ticks. [CDC explanation of zoonotic diseases](https://www.cdc.gov/one-health/about/about-zoonotic-diseases.html).

One Health puts these connections into the same investigative picture. An illustrative application would be veterinary reports of unusual animal illness prompting public health teams to assess potentially exposed people and consider appropriate testing. Environmental information can add context about changing habitats or exposure opportunities. This is a practical inference from the framework, rather than a finding from a specific trial. WHO identifies habitat disruption, agriculture, animal trade and other pressures on ecosystems as factors that can create opportunities for disease emergence. [WHO One Health fact sheet](https://www.who.int/news-room/fact-sheets/detail/one-health).

What turns One Health surveillance into effective prevention?

The joint action plan covers six connected areas, including emerging zoonotic threats, food safety, antimicrobial resistance and environmental health. Its scope matters because collecting laboratory results is only one component of prevention. WHO describes the plan as a framework for building capacity and coordinating action across organizations and sectors. It provides guidance rather than evidence that every participating setting has the staff, laboratories or resources needed to implement it fully. [WHO joint action plan overview](https://www.who.int/teams/one-health-initiative/quadripartite-secretariat-for-one-health/one-health-joint-plan-of-action).

For households, established precautions remain useful: wash hands after animal contact, handle food safely, prevent insect bites and avoid unnecessary contact with sick wildlife. Animals can carry some infectious organisms while appearing healthy. These measures address particular exposure routes; they do not replace the surveillance and response systems needed to investigate wider threats. [CDC prevention guidance](https://www.cdc.gov/one-health/about/about-zoonotic-diseases.html).

A practical implication is that program assessment should examine what happens after an alert: whether relevant teams receive it, whether an investigation follows and whether appropriate protective action reaches exposed communities. Those are proposed measures of implementation, not results reported by the extension announcement. The planned review of the One Health framework offers an opportunity to document progress, limitations and lessons before its next phase. [One Health implementation review](https://www.woah.org/en/quadripartite-collaboration-extends-the-one-health-joint-plan-of-action-to-2029/).