re: Will you take a covid vaccine if they come out with one?

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True.
But, that proves
Efficacy and absence of short term side effects.

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Correct. Like most other vaccines and pharmaceuticals.

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Unless they have a time machine long term effects are at best an educated guess.

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There is enough scientific evidence based on other vaccines to have a good understanding, but sure no one knows the long term side effects. I guess that is true of every vaccine depending on how long you are referring to as "long term" side effects.