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So here in this question, in first part, epidemiology is the study of science.
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Epidemiology is the study of science that investigates all the factors, that investigates all the factors that determine the presence or absence of disease, that determines presence and absence of disease.
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Occurring in a population and in second part period prevalence in epidemiology is the number of individuals is the number of individuals identified as cases during a special period of time identified as cases during a special period of time divided by the total number of people in population, divided by total number of people in population.
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Other than that, in incidence of disease is a measure that allows us to determine a measure that allows us to determine a person's probability of being diagnosed with a disease.
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A person's probability of being diagnosed with a disease, being diagnosed with a disease during a given period of time, during a given period of time.
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In third part, in epidemiology, sporadic disease are those diseases, sporadic disease are those disease which occurs only, which occurs only, irregularly or occasionally from time to time, irregularly or occasionally from time to time in a few isolated places without spatial pattern, without any spatial pattern...