Highly unlikely that your 100% statistic is true. Polio rages on today in Africa because of one reason: the oral polio vaccine. Wild type polio has actually b

Highly unlikely that your 100% statistic is true. Polio rages on today in Africa because of one reason: the oral polio vaccine. Wild type polio has actually been eliminated but sixteen African nations are battling outbreaks of what's called "vaccine-derived polio." https://www.npr.org/sections/goatsandsoda/2020/08/25/905884740/africa-declares-wild-polio-is-wiped-out-yet-it-persists-in-vaccine-derived-cases https://www.npr.org/sections/goatsandsoda/2020/08/25/9058847...