Which studies proved that the polio vaccine worked?
Did they spend years on those studies before they rolled out the vaccine?
The polio vaccine was a fiasco that caused many deaths and paralysis. http://www.whale.to/a/mcbean5.html
Polio was uncommon and its frequency in America rose dramatically in exact timing and degree to which DDT, lead arsenate and calcium arsenate use ramped up. Then the vaccines “cured” (with no consideration of other long term effects) it when DDT was banned. Do some research. google polio DDT OR arsenate