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EPIDEMIOLOGY OF INFECTIOUS DISEASE: GENERAL PRINCIPLES

Studies of the epidemiology of infectious diseases include evaluation of the factors leading to infection by an organism, factors affecting the transmission of an organism, and those associated with clinically recognizable disease among those who are infected. Many epidemiologic concepts were originally developed in studies of infectious diseases. Some of these fundamental concepts were applied later to the study of noninfectious disease. Among these concepts are the following: