Epidemiology/ˌepɪˌdiːmiˈɑːlədʒi/ Definition 1 of 1Pro Tip 1/3Non-human subjects Epidemiology often involves animals and the environment, not just humans. Bird flu's epidemiology shows how diseases can jump from animals to humans. Pro Tip 2/3Beyond illness Epidemiology also studies factors like nutrition and behavior, not just diseases. The epidemiology of obesity includes diet and exercise patterns. Pro Tip 3/3Public health context Epidemiology is crucial in public health for planning and policy making. Epidemiology provides data to strategize vaccination campaigns.