What does the term epidemiological transition mean?

Question

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The term epidemiological transition refers to the shift in patterns of morbidity and mortality that take place as countries undergo the process of modernization from third-world status to first-world status. This transition is characterized by a shift from infectious diseases to chronic diseases as the primary causes of death. The transition typically takes place in four stages over several decades or even centuries.

What Does the Term Epidemiological Transition Mean