Measles charts (US) [1] Line goes down to nearly zero and stays there. Polio chart (US) [2] See the line go almost straight down to 0 after vaccine introductio

Measles charts (US) [1] Line goes down to nearly zero and stays there. Polio chart (US) [2] See the line go almost straight down to 0 after vaccine introduction and stay there. Smallpox has been totally exterminated by vaccination. Any questions? [1] https://ourworldindata.org/grapher/measles-cases-and-death https://ourworldindata.org/grapher/measles-cases-and-death [2] https://ourworldindata.org/grapher/prevalence-of-polio-rates-in-the-united-states https://ourworldindata.org/grapher/prevalence-of-polio-rates...