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Interventions applied at different points along the natural history of disease.
The Epidemiological Triad
The classic model of disease causation and its use in outbreak control.
Endemic, Epidemic & Pandemic
Terms describing how much disease is present in a population.
Screening (Wilson's Criteria)
Testing apparently healthy people to detect disease early.
Sensitivity & Specificity
Measures of how well a diagnostic test performs.
Epidemiological Study Designs
The main designs used to study disease and its causes.
Measures of Disease Frequency
Quantifying how much disease is present in a population.