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CONCEPT OF DISEASE (Epidemiologic triad & Rothman’s Causal Pies)

A. Disease: Any harmful deviation from the normal functional/ structural state of an organism/ person.  The normal state of the organism (human/plant) represents the condition of physiological balance (homeostasis). B. Epidemiologic triad The traditional model for infectious disease:- Interaction of these three factors is necessary to initiate the disease process (agent, host & environment). These three factors are

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