Which of the following statements best define epidemiological transition?

a. A change from morbidity due to a particular infectious disease to a different infectious disease
b. A change from mainly infectious diseases to chronic diseases
c. A change in infectious diseases caused by a difference in agent, host, or environment
d. A change in life spans of various age groups in a specific country


ANS: B
Many developed countries experienced an epidemiological transition from having an infectious disease profile to having a chronic disease profile and are now plagued by chronic diseases. Once plagued with high rates of infectious disease, developed countries significantly reduce high mortality rates from these diseases through improved sanitation, nutrition, and immunization and improved health care. Most developed countries have a more stable economy and a wide range of industrial and technological development. These countries experience an epidemiological transition. The other statements do not define epidemiological transition.

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