We tried that. It reduced the frequency with which it happens, but not as much as we would like. https://www.science.org/content/article/first-polio-cases-lin

We tried that. It reduced the frequency with which it happens, but not as much as we would like. https://www.science.org/content/article/first-polio-cases-linked-new-oral-vaccine-detected-africa https://www.science.org/content/article/first-polio-cases-li...