You are just regurgitating the slops of Big Pharma propaganda. I have heard this same tired old claim about polio made by many ignorant people who were indoctrinated into the vaccine cult. It is rubbish. Polio didn't even exist before the early 1900s. Polio was a disease of modernity most likely caused by environmental factors. The first polio vaccine was an unmitigated disaster and this is not up for debate. Later they redefined the symptoms of polio so that exactly the same presentation was no longer diagnosed as polio but as some form of encephalitis. I'm not against vaccines, just against the lies and deceit of the pharma companies that have revolving door relationships with governments and use every imaginable dirty trick to hide their mistakes and sell their defective products or encourage the powers that be to force these upon the bewildered masses.