the word that spring to mind is Bulls**t!
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The flu vaccines they have now are notoriously ineffective. I don't see how they can claim to come up with a lifetime vaccine for something that is constantly mutating and changing.
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That aside - even if they could do it and it did work, the same concerns I have for all vaccines would remain. What is in it? how do those ingredients  and components iseparately and in combination impact the human body in the long term. Answers they don't have for any of the current vaccines, so surely won't have them for this one either.