In all the shifts I have worked at the vax center, there has been 1 reaction requiring an ambulance, and 1 person who drove back 3 days after the jab to say she was still having a reaction and wanted advice. Don't know what either reaction was.

Of all the folks I know personally who have had their second jab, only one had any not-just-sore-or-tired reaction, and it was a fit of shivering and feeling like they were freezing, which happened about 15 hours later and lasted about 20 mn.