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Epidemiology

study of the occurence,distribution,and determinants of health and disease in a population

Epidemiologist

traces the spread of disease to identify its origin and mode of transmission

Epidemic

the occurance of a disease in an unusually high number of individuals in a population at the same time

Pandemic

world-wide epidemic- widely distributed

Endemic

disease constantly present, usually at low incidence, in a population.As long as endemic lasts, the few infected people are called reservoirs

Incidence

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.

Prevalence

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

Sporadic

cases of disease may occur when individual cases are recorded in geographically seperated areas, implying that the incidents are not related

Outbreak

a number of cases are observed, usually in relatively short period of time, in an area previously experiencing only sporadic cases of the disease

Subclinical Infections

diseased individuals who show no symptoms or only mild symptoms

Carrier

subclinical infected individuals are frequently carriers of a particular disease

Mortality

incidence of death in a population

Morbidity

incidence of disease in a population and includes both fatal and nonfatal dieases

Resevoirs

sites in which viable infectious agents remain and from which infection of individuals may occur. May be animate or inanimate

Zoonosis

a dieases that primarily infects animals, but is occasionall transmitted to humans

Saprophytic

living on dead matter

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