John, the nurse manager in a large urban emergency department, was alerted to a number of patients who had come in with a possible exposure to a toxic substance. He begins with the epidemiological triangle to help understand:

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The epidemiological triangle is a model used to understand the relationship between an agent, a host, and the environment in the development of disease. It is used to identify the factors that contribute to the occurrence of a disease and to develop strategies for prevention and control. In this case, John is using the epidemiological triangle to help understand how the environment brought the agent (toxic substance) and the host (patients) together.

John, the Nurse Manager in a Large Urban Emergency Department