Not a clue, some vaccines are more dangerous than others.Do you know IT Minion if historically have their ever been vaccines that have had similar side effects to the "exceptionally rare" side effects that have occurred in younger people with the AZ vaccine?
Do you know SirGalahad how close the US is to licensing AZ? Is there any country that's refused to license it yet?
The Anthrax vaccines are particularly risky with around 1% of injections having serious side effects. Of course for Anthrax that 1% risk is massively less than the risk of contracting Anthrax, which means it isn't suitable for prophylactic use for the entire population but it'd very useful if you think there's a high chance that you're going to be exposed.
https://en.m.wikipedia.org/wiki/Anthrax_vaccines