Epidemiology is the study of the distribution and determinants of health and disease in human populations (World Health Organization, 2017) and is the principal science of public health. It entails a body of knowledge derived from epidemiological research and specialized epidemiological methods and approaches to scientific research. Community health nurses use epidemiological concepts to improve the health of population groups by identifying risk factors al optimal approaches that reduce disease risk and promo health. Epidemiological methods are important for accura community assessment and diagnosis and in planning ill evaluating effective community interventions. This cha ter discusses the uses of epidemiology and its specializi methodologies.
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