Originally posted by timb64 Had my first AZ vaccination on Monday,left with mild flu-like symptoms for 24 hours and some very feverish dreams!
Reassured, that's a great sign - those symptoms mean a great response, that your body really reacted and should produce a heap of antibodies.
Where there's absolutely no reaction at all, well, there's that percentage chance (5% or whatever) that it hasn't helped you.
Of course, there's a tiny chance your body gets it completely wrong and anaphylaxis kicks in, but that's why you have to wait 15 minutes with somebody who has an epipen able to eyeball you, before they let you home!