How long after booster can you blame it for feeling unwell/

[UtterlyUnimaginativeUsername]

We both had the booster yesterday and today DH is in bits with flueyness. At what stage does he need to do a PCR just in case?

2 days
www.nhs.uk/conditions/coronavirus-covid-19/coronavirus-vaccination/safety-and-side-effects/

If you have a high temperature that lasts longer than 2 days, a new, continuous cough or a loss or change to your sense of smell or taste, you may have COVID-19. Stay at home and get a test

Thanks folks, it's good to know where we stand.

I was ill for 48 hours after mine, then suddenly felt right as rain again. Really bizarre. Chills, fever, heavy legs, weird taste, woolly head.