Disease Epidemiology

Epidemiology is the study and analysis of the distribution (who, when, and where) and determinants of health and disease conditions in defined populations. It is the cornerstone of public health, and shapes policy decisions and evidence-based practice by identifying risk factors for disease and targets for preventive healthcare. Epidemiologists’ help with study design, collection, and statistical analysis of data, amend interpretation and dissemination of results (including peer review and occasional systematic review). Epidemiology has helped develop methodology used in clinical research, public health studies, and, to a lesser extent, basic research in the biological sciences.
There are 6 components of the infectious disease process constituting chain of disease transmission i.e. the agent, its reservoir, its portal of exit, its mode of transmission, its portal of entry, susceptible host.

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