Where does the "no vaccine is tested" myth come from?
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The same place other science denying lies come from, their need to invent "alternative facts" to maintain their self-delusions. All it takes is for one of them to confidentiality assert the false claim and the rest will keep repeating it no matter how many times it's debunked.
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Oh look. All that safety testing of vaccines I did in various labs, must have been my imagination.

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Honest question...when multiple vaccines are given at any one time, has this been tested for safety before schedules are published?
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So just anti-*all available vaccines*? Got it.
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Yes, it's a basic problem with the "precautionary principle" in general. You can never do enough testing to prove anything is absolutely safe.
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