Former Vice President and Chief Science Officer for Pfizer for 16 years, Dr. Mike Yeadon, says.
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Polio is around 99%, but most aren’t that high. In most cases a vaccine is NEVER. I mean never 100%.
https://www.cdc.gov/vaccines/vpd/polio/index.html
The purpose of vaccinations are not 100%. It’s to save lives and get enough people immune to slow or stop a disease from spreading because large amounts of people are immune. 100% would be great. Most are 60-90% effective depending on the disease.
Do your own research. As far as I know, no vaccine has ever been 100% effective. Although, polio is pretty darn close.