epidemiology
noun
ep·i·de·mi·ol·o·gy
ˌe-pə-ˌdē-mē-ˈä-lə-jē
-ˌde-mē-
1
: a branch of medical science that deals with the incidence, distribution, and control of disease in a population
2
: the sum of the factors controlling the presence or absence of a disease or pathogen
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Merriam-Webster unabridged
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