rationalskepticism.org

OK so the OP has de cloaked as a an extreme anti vaxxer and non believer in diseases generally. So Polio, a little off topic but why would people risk rare side effects to prevent

several hundreds of children die of “wild polio”

? Because that is not what the Polio elimination program seeks to do, it seeks to eliminate Polio to prevent the massive epidemics that we used to see before vaccines became available and to actually cease the requirement to vaccinate against Polio once the last reservoirs are eliminated. I could post some photos from the 1950's outbreaks of schools closed and banks of children in iron lungs, but they tend to show only the very tip of the iceberg, what they don't show are those affected outside of a handful of western countries.
But I doubt the OP will swayed by facts and will continue to promote the line agreed with by Boko Haram and the Pakistani Taliban.