In One Health, disease ecology is defined as...

• A. The study of how interactions among hosts, pathogens, and the environment shape disease dynamics.
• B. The study of economic costs of diseases.
• C. The study of plant disease management only.
• D. The study of clinical trial outcomes.

Answer: (A)

Disease ecology in One Health looks at how interactions among hosts, pathogens, and the environment shape how diseases spread and persist. It considers how a pathogen moves between species, which animals or insects act as reservoirs or vectors, and how environmental factors—like temperature, humidity, land use, and biodiversity—change contact rates and transmission. Changes in ecosystems, climate, or human/animal behavior can alter outbreak risk, spillover events, and seasonal patterns. By focusing on these ecological relationships, we can better predict and mitigate disease threats across humans, animals, and the environment.

The other options miss this integrative, ecosystem-focused view: economic cost studies examine financial impact rather than ecological dynamics; plant disease management centers on crops alone; and clinical trial outcomes evaluate interventions rather than how diseases move through real-world ecosystems.