DDT was made in 1874, first polio outbreak was 1894. Other pesticides also existed before that time. The timeline is curious isn't? They started regulating pesticides in the 1950s at the same time we saw a drastic reductions in polio and small pox. By the 70s total bans on the worst pesticides had been enacted and at the same time both diseases were declared eradicated. Not quite though, the vaccines still cause damage they just give it other names like cerebral palsy and MS.