please read the me Three Epidemiological Models
Epidemiological Triangle

Web of Causation

The Wheel Model

Epidemiological Triangle
Epidemiological Triangle
Model used for many years
Three segments
Host: degree that a person is able to adapt to stressors
Agent: biological, chemical, or physical
Environment: influences probability of contact between host and agent
Implies that each segment must be analyzed and understood in order to predict a disease

Web of Causation
Web of Causation
Effects never depend on single isolated causes
Web develops as a result of chains of causation
Each link is the result of a complex genealogy

The Wheel Model
Consists of a hub (host or human) that has genetic makeup as its core
Surrounding host is the environment
Biological
Social
Physical
Implies a need to identify multiple etiological factors of disease without emphasizing the agent of disease

dia video and the powerpoint