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Basic Principles of Diseases

Background

Field officers providing veterinary services in disease investigation may think biological agents, such as bacteria, viruses or parasites alone are responsible for disease. However, there are non-infectious causes, such as toxins, trauma, nutritional and management stress. In addition, the same agent may not always result in the same clinical signs in different animals or different environments. Field officers should consider the relationships between the agent, the host and the environment. The concept of the "epidemiological triangle" helps to illustrate this idea. This triangle relates the agent, the host and the environment.