In public health, which concept entails examination of host, agent, and environment interactions?

The concept that examines the interactions between host, agent, and environment is known as the epidemiological triangle. This model is fundamental in understanding how diseases spread and the interrelationship between these three components. The host represents the individual or population that can be affected by a disease, the agent is the microorganism or factor that causes the disease, and the environment encompasses all external factors that influence the host's exposure to the agent.

In applying this model, public health professionals can identify strategies for disease prevention and control. For example, by modifying the environment, they can reduce the chances of disease transmission, or by enhancing the host's immunity, they can decrease susceptibility to the agent.

The other options, such as preventive medicine and health promotion, focus on broader concepts and strategies for health improvement and disease prevention but do not specifically analyze the interactions of the host, agent, and environment as elaborately as the epidemiological triangle does. Epidemiological transition, on the other hand, refers to the change in disease patterns and causes of mortality over time, rather than the dynamics between host, agent, and environment that the epidemiological triangle encapsulates.