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[–] probablysarcastic 1 point -1 points (+0|-1) ago 

Nothing can be proven 100% safe. Not even 100% certified free trade gluten free organic free range chia seeds.

However, how many people do you know currently confined to an iron lung?

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[–] JohnQCitizen ago 

No one is saying the polio vaccine is dangerous. In fact most of them are safe. But when a new vaccine comes out, waiting to make sure there isn't an issue isn't a bad thing.