What is the One Health concept and why is it important for environmental health practice?

• A. It focuses solely on human health without considering animals or environment
• B. It emphasizes the economic aspects of health care
• C. It recognizes interconnection of human, animal, and environmental health; informs surveillance, zoonotic disease control, and environmental management
• D. It is unrelated to public health practice

Answer: (C)

One Health is the idea that human health, animal health, and the environment are deeply connected, and actions in one area influence the others. In environmental health practice, this matters because many health risks arise at the intersection of people, animals, and ecosystems. Changes in land use, climate, pollution, or animal populations can alter how diseases emerge and spread, as well as how people are exposed to hazards.

Because of this interconnection, surveillance and interventions work best when they involve multiple sectors—public health, veterinary health, wildlife, and environmental authorities—sharing data and coordinating actions. This approach informs how we monitor for zoonotic diseases, how we implement control measures at the source (such as animal reservoirs or habitat changes), and how we manage environments to reduce risk.

Examples help illustrate the idea: vaccinating dogs to prevent human rabies, monitoring influenza and other pathogens in livestock to anticipate human outbreaks, and addressing environmental factors like water quality, habitat disruption, and pollution that influence vector populations and exposure. Antimicrobial resistance across humans, animals, and the environment also requires integrated stewardship.

So the best description captures the interconnection of human, animal, and environmental health and its use in guiding surveillance, zoonotic disease control, and environmental management.