Several models are used to explain disease causation:
1. Epidemiologic Triad: This model considers disease as a result of the interaction between the host, agent, and environment. 2. Web of Causation: This model represents the complex, interrelated factors that contribute to disease, emphasizing the interconnected nature of various determinants. 3. Multicausal Model: This model suggests that multiple factors, both necessary and sufficient, contribute to the development of a disease.