Which of these five phases in the modern era of public health do you feel was most significant in protecting the public’s health, and why?

The five phases in the modern era of public health were discussed in some detail during our second class meeting and also appear in your assigned readings. Each of these periods was a substantive genre, during which key contributions were made and developments were realized, all of which helped galvanize and profoundly change the modern public health system.
Which of these five phases in the modern era of public health do you feel was most significant in protecting the public’s health, and why? Each period in the modern era had its strengths (and weaknesses). Please provide your thoughts (positive and/or negative) as an entry in this discussion thread to stimulate dialogue on this topic, and be sure to BRIEFLY state the reasons why you feel as you do. One or two paragraphs will suffice, and your response is required.

Ive attached a video explaining what the 5 phases in the modern era of public health is