Total number of individuals carrying a disease within a period of time. Prevalence is almost always higher than incidence because a majority of affected patients will carry their disease for several years before being cured or dying.
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myopia 2 (MYP2) (Hereditary nearsightedness of severe degree; aka extreme myopia (EM). Myopia is classified as ...)
CDC (US Centers for Disease Control and Prevention, based in Atlanta, GA. The centers are involved ...)