Key words: disease, illness, population, distribution, factors.
Epidemiology is defined as the study of disease and illness distribution in certain populations.
In epidemiology, we need to collect the information about cases, in order to discover the potential factors of the disease and illness.
More definitions of epidemiolgy: webpage link
The epidemiologists analyze when, who and how of disease occur in specific populations. Given the knowledge of the disease patterns, epidemiologists try to control the outbreak of the disease and prevent health problems developing among large populations.
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