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Secular trends changes in disease frequency over time Aims of Epi 1. Describe health status of population 2. Explain etiology (cause) of disease 3. Predict occurrence of disease 4. Control occurrence Goals of Epi understand natural history and what influences the distribution Foundations of Epi 1. Interdisciplinary 2. Quantification 3. Use of special vocal: surveillance and epidemic threshold Surveillance systematic collection of data pertaining to the occurrence of a disease, analysis of data, dissemination of disease-related info
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