What historical phenomena are most responsible for the preparation of public health responses? 3) In your opinion, what characteristics of public health make it different from other fields? What characteristics are more unique and distinctive? Why? 4)Compare two achievements of public health in the 20th century America presented in Chapter 1 (Prevention and Control of Infectious Diseases Case Study) and (See Tobacco Use). Which of these achievements, in your opinion, has had the greatest impact on the health status and quality of life of Americans living in the 21st century?