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Polio epidemics did not exist in the US prior to the Salk vaccine.
That is factually incorrect and frankly just idiotic. 15,000+ cases of polio were occurring per year around 1950. The Salk vaccine was started to be widely used in 1955. Sorry, but your ignorance should not be tolerated because if people listen to you, their kids could die. Badly. And it will be your fault.