Zoonotic Disease and Animal Welfare: Prevention at the Interface

Zoonotic diseases transmitting between animals and humans are often linked to poor animal welfare conditions. Improving welfare can reduce disease emergence risk while benefiting animals directly.

Key Facts

An estimated 75% of emerging infectious diseases are zoonotic, originating in wildlife or domestic animal populations.
Crowded, stressed animals in live animal markets and intensive farms show elevated viral shedding and reduced immune function.
Avian influenza strains emerge and spread most rapidly in high-density poultry farming environments.
Healthy, well-managed animal populations with low stress have lower pathogen loads and reduced spillover risk.
The One Health framework recognizes that human, animal, and environmental health are inseparably linked.

Welfare Considerations

The COVID-19 pandemic renewed attention to zoonotic disease emergence at the human-animal interface. Animal welfare conditions are directly relevant: stressed, immunosuppressed animals in crowded conditions are more likely to harbor and amplify pathogens that can spillover to humans. Live animal markets that mix species and wild-caught animals with domestic species create particularly high-risk mixing conditions. Improving animal welfare — reducing crowding, eliminating live wildlife markets, ending high-density factory farming — serves both animal and human health simultaneously, creating powerful aligned incentives for welfare improvement.

What You Can Do

Support the One Health framework that integrates animal, human, and environmental health.
Advocate for closing live wildlife markets and banning wild animal trade for food.
Reduce consumption of factory-farmed products where pathogen risk is concentrated.
Follow WHO and FAO One Health programs for integrated disease prevention approaches.
Support animal welfare improvements as public health investments, not just ethical choices.