Not that deep.
I would like you to enlighten me (srs).
I know you're going to say they tested everything and essentially it builds on previous vaccines anyway so it should be safe.
But the thing is the Pfizer vaccine should be quite revolutionary and trials can only tell you so much. As someone who is not at much risk, I don't really want to be the first to get it.
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Wel you both have a very legit concern, because one element is missing.
Human trials normally go trough several stages. Smaller group and enlarging from there. You need a pretty large test population including pre-existing conditions, always statistically relevant.
Now, for Covid because an absurd amount of cash and cash promises was trown at it, the testing populations where incredibly large and like Seven says, there are previous vaccins on which its based, its not like medication. The systematic effects (chemicals go trough several parts of the body and can get altered on the way or do unexpected things. Viagra was supposed to assist in low oxygen enviroments, the erection was an unforeseen side effect).
Now because the population was absolutely gigantic, pretty much all groups and conditions have been covered.
Except time.
In the 70ties, there was the softenon catastrophy. Softenon was a medicin for pregnant woman that aids with the majority of early pregnancy nuisance.
however, softenon is a racemix mix. It contains 2 stereoisomers. the active ingredient and its mirrored one. The stereo isomer, however, caused severe birth defects causing a very large amount of miscarriages.
How did this happen ?
1) not tested on pregnant whoman (covid covers all groups)
2) not tested long enough to see this actual side effect
Covid however is a vaccene. The chances of a time effected side effect is incredibly small, since its an evolution/adaptation from previous vaccins, with
normally no changes that could worry.