Back when the Polio vaccine was invented, people weren't so hungry for profits as much as today. Pharma was around when the vaccine came out, but not like they are today, where everyone knows how much profits mean to them, as we can see with the thousands dying yearly by a doctor's over prescribing. There are always scientists that are trying to help others, as it gives them gratification doing so, and there are always those who are only looking to profit by their inventions, but it doesn't matter if they work, and some vaccines have been proven over decades to work, and total eradication didn't happen with a few diseases because some chose not to vaccine. Studies are one thing, and if they are a huge study, they mean something, but opinions are meaningless. Fact is the Polio vaccine worked, and saved many lives. How many it's impossible to know, as many people don't need vaccines as their bodies can handle diseases where others can't. If you'll look at the people who live, and have lived in the Blue Zone areas, they live longer on average than anywhere else on earth, and they get vaccines. Living longer is all the proof anyone needs. Wiki explains the basic happenings.......https://en.wikipedia.org/wiki/Polio_vaccine
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