having posted on here a couple of times about lack of reaction to the shots from everyone I know - in all fairness I have to report a lady I know locally (female early 40's) had an Astra Zeneca first shot at the weekend and spent 36 hours with a full set of 'flu symptoms - aches, headache, not eating, sleeping etc etc. Then it was like switching the light back on and she rejoined humanity within 30 minutes apparently and is totally normal.
The quack reckoned that younger folk have stronger, working anti-immune system