Definitions in epidemiology can vary for several reasons:
Contextual Differences: Definitions may change depending on the context of the study. For example, the definition of an outbreak may differ between urban and rural settings. Purpose of Study: The goals of a study can influence definitions. A study focusing on geographic distribution may define a case differently than one investigating causal factors. Temporal Factors: Over time, definitions may evolve as new scientific knowledge emerges. For instance, the definition of communicable diseases has changed with advancements in microbiology.
