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study of the occurence,distribution,and determinants of health and disease in a population
the occurance of a disease in an unusually high number of individuals in a population at the same time
disease constantly present, usually at low incidence, in a population.As long as endemic lasts, the few infected people are called reservoirs
the number of cases of an individual disease in a population in a given time period. Provides a record of new cases of a disease.
the total number of new and exisiting disease cases reported in a population in a given time period. Indicates total disease burden in a population
cases of disease may occur when individual cases are recorded in geographically seperated areas, implying that the incidents are not related
a number of cases are observed, usually in relatively short period of time, in an area previously experiencing only sporadic cases of the disease
sites in which viable infectious agents remain and from which infection of individuals may occur. May be animate or inanimate
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