Zoonotic diseases — infections transmissible between animals and humans — represent a critical interface between animal welfare and human health. Many significant welfare problems in livestock populations are zoonotic diseases that also threaten human health, creating shared incentives for prevention and control that benefit both human and animal welfare simultaneously.
Salmonella: Causes illness and death in poultry flocks and pigs, and significant human gastroenteritis. Control through vaccination, biosecurity, and hygiene reduces animal suffering and human disease simultaneously. Campylobacter: Leading cause of human food poisoning in the UK; in poultry causes intestinal disease. Biosecurity measures protecting flocks from wild bird contamination reduce both animal and human welfare harms. E. coli O157: Cattle reservoir; causes severe illness in humans. Good cattle husbandry, hygiene, and targeted interventions reduce shedding and human risk. Bovine tuberculosis: Affects cattle with welfare consequences including culling; also transmissible to humans through unpasteurized milk.
The One Health approach — recognizing the interdependence of human, animal, and ecosystem health — provides the framework for addressing zoonoses holistically. Improving animal health welfare reduces zoonotic disease reservoirs; protecting ecosystems reduces wildlife-livestock-human transmission pathways; veterinary and human medical systems share surveillance and response capabilities.
Prevention strategies that improve animal welfare simultaneously reduce zoonotic risk: vaccination programs, good nutrition and housing supporting immune function, biosecurity preventing pathogen introduction, and rapid treatment of disease cases all reduce zoonotic pathogen loads in animal populations.
Part of the Animal Welfare Hub — 2403+ pages of evidence-based animal welfare information.