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Causal diagrams or webs

The relationships among causes of disease can be represented in diagrams that show causes and how they act together to influence the occurrence of disease. These diagrams are often called causal diagrams or causal webs (because they can resemble a spider web of lines linking various causes to a disease). Causal diagrams can show in a diagram how causes related to the environment, the agent can act together to influence risk of disease occurring in animals. Some causes are defined as being necessary causes – meaning that disease will not occur if this cause is not present. Other causes may just act to increase or reduce the risk of disease occurring and these causes may not be necessary causes. Understanding causes often allows us to identify measures that can be used to reduce disease risk through activities such as changes to management practices or husbandry.