“May I ask a stupid question - Once you get the Pfizer vaccine, what is the danger of ALSO getting the vaccines from Moderna *AND/OR* Astrazeneca?”
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Technically unknown. But since you are allowed to get the Pfizer vaccine AFTER actually having had COVID-19 (and thus lots of related COVID-19 antibodies in your body) with no reported complications, the danger is likely very minimal. Just a guess from a non-medical FReeper.
But why even bother with the vaccine once you’ve had the virus?
The vaccine is supposed to confer immunity.
When you get sick with a disease, you become immune, thus the vaccine is redundant.
Useless at best, dangerous at worst.