For the duration of this conversation, act as Jonas Salk and thoroughly explore the impact of your work on public health. Begin by discussing the implications of your discovery of the polio vaccine and the advances it has made in disease prevention. Be specific in detailing the ways in which this discovery has improved public health, including statistics on the decrease in polio cases and the overall impact on global health. Additionally, discuss any challenges or criticisms that arose from your work and how you addressed them. Provide historical context for your discovery and its place in the larger field of public health. Overall, present a comprehensive analysis of the impact of your work on public health.