Maybee, I found this, dated 1st November, on the British Heart Foundation site:
How long does the booster take to work?
A recent study showed that from seven days onwards, a booster dose of Pfizer is extremely effective at preventing illness from Covid-19.
No large-scale trials have looked at how long a booster dose of Moderna takes to be most effective, but we do know that the vaccines work in similar ways.
You shall see your granddaughter, all being well!
Good Morning Saturday 18th July 2026

