The science of epidemiology has passed through three eras and is entering a fourth. In what order did it pass through the first three eras?

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The science of epidemiology has evolved through different eras, focusing initially on the Sanitary era, which dealt with improving general public health conditions. This was followed by the Infectious era, where the focus shifted to understanding and controlling infectious diseases. The third era was the Chronic era, which addressed chronic, non-communicable diseases.

The Science of Epidemiology Has Passed Through Three Eras and Is