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The term epidemiology is now widely applied to cover the description and causation of not only epidemic, infectious disease, but of disease in general, including related conditions. Some examples of topics examined through epidemiology include as high blood pressure, mental illness and obesity. Therefore, this epidemiology is based upon how the ...
MacMahon co-authored the textbook Epidemiologic Methods (1960), later reissued as Epidemiology: Principles and Methods, with Thomas Pugh. Described by Willett as "the first modern epidemiology textbook", it became a standard text in the subject.
Epidemiological (and other observational) studies typically highlight associations between exposures and outcomes, rather than causation. While some consider this a limitation of observational research, epidemiological models of causation (e.g. Bradford Hill criteria) [7] contend that an entire body of evidence is needed before determining if an association is truly causal. [8]
is the average number of people infected from one other person. For example, Ebola has an of two, so on average, a person who has Ebola will pass it on to two other people.. In epidemiology, the basic reproduction number, or basic reproductive number (sometimes called basic reproduction ratio or basic reproductive rate), denoted (pronounced R nought or R zero), [1] of an infection is the ...
Leon Gordis (July 19, 1934 – September 7, 2015) [1] was an American epidemiologist, professor and author, whose textbook Epidemiology provided a foundation for the understanding of epidemiologic principles and clinical applications.
An infection rate or incident rate is the probability or risk of an infection in a population.It is used to measure the frequency of occurrence of new instances of infection within a population during a specific time period.